Drop use_source_config_var from prebuilt selection

This CL makes this property a no-op from the perspective of prebuilt
selection. The primary user of this was mainline modules, but they have
now switched to RELEASE_APEX_CONTRIBUTIONS_* for prebuilt selection,
both for internal `main` development and in partner drops.

Test: in internal, lunch cf_x86_64_phone-next-userdebug; m nothing; and
verified there was a path to the prebuilt bt apex

Test: in partner workspace, lunch gsi_partner_arm-ap31-userdebug; m
nothing; and verified that there was a path to the prebuilt adservices apex

Bug: 308188211
Change-Id: I124a6dada5c20aca4bdebf70dcbe5bbec28cefbe

3 files changed, 0 insertions, 169 deletions

diff --git a/android/prebuilt.go b/android/prebuilt.go
index 91ba05b6b..2b7b55b5d 100644
--- a/android/prebuilt.go
+++ b/android/prebuilt.go
@@ -706,11 +706,6 @@ func (p *Prebuilt) usePrebuilt(ctx BaseMutatorContext, source Module, prebuilt M
 		return true
 	}
 
-	// If the use_source_config_var property is set then it overrides the prefer property setting.
-	if configVar := p.properties.Use_source_config_var; configVar != nil {
-		return !ctx.Config().VendorConfig(proptools.String(configVar.Config_namespace)).Bool(proptools.String(configVar.Var_name))
-	}
-
 	// TODO: use p.Properties.Name and ctx.ModuleDir to override preference
 	return Bool(p.properties.Prefer)
 }
diff --git a/android/prebuilt_test.go b/android/prebuilt_test.go
index 2241b0815..2574ed487 100644
--- a/android/prebuilt_test.go
+++ b/android/prebuilt_test.go
@@ -295,158 +295,6 @@ func TestPrebuilts(t *testing.T) {
 				}`,
 			prebuilt: []OsType{Android, buildOS},
 		},
-		{
-			name: "prebuilt use_source_config_var={acme, use_source} - no var specified",
-			modules: `
-				source {
-					name: "bar",
-				}
-
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}`,
-			// When use_source_env is specified then it will use the prebuilt by default if the environment
-			// variable is not set.
-			prebuilt: []OsType{Android, buildOS},
-		},
-		{
-			name: "prebuilt use_source_config_var={acme, use_source} - acme_use_source=false",
-			modules: `
-				source {
-					name: "bar",
-				}
-
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}`,
-			preparer: FixtureModifyProductVariables(func(variables FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "false",
-					},
-				}
-			}),
-			// Setting the environment variable named in use_source_env to false will cause the prebuilt to
-			// be used.
-			prebuilt: []OsType{Android, buildOS},
-		},
-		{
-			name: "apex_contributions supersedes any source preferred via use_source_config_var",
-			modules: `
-				source {
-					name: "bar",
-				}
-
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}
-				apex_contributions {
-					name: "my_mainline_module_contribution",
-					api_domain: "apexfoo",
-					// this metadata module contains prebuilt
-					contents: ["prebuilt_bar"],
-				}
-				all_apex_contributions {
-					name: "all_apex_contributions",
-				}
-				`,
-			preparer: FixtureModifyProductVariables(func(variables FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "true",
-					},
-				}
-				variables.BuildFlags = map[string]string{
-					"RELEASE_APEX_CONTRIBUTIONS_ADSERVICES": "my_mainline_module_contribution",
-				}
-			}),
-			// use_source_config_var indicates that source should be used
-			// but this is superseded by `my_mainline_module_contribution`
-			prebuilt: []OsType{Android, buildOS},
-		},
-		{
-			name: "apex_contributions supersedes any prebuilt preferred via use_source_config_var",
-			modules: `
-				source {
-					name: "bar",
-				}
-
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}
-				apex_contributions {
-					name: "my_mainline_module_contribution",
-					api_domain: "apexfoo",
-					// this metadata module contains source
-					contents: ["bar"],
-				}
-				all_apex_contributions {
-					name: "all_apex_contributions",
-				}
-				`,
-			preparer: FixtureModifyProductVariables(func(variables FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "false",
-					},
-				}
-				variables.BuildFlags = map[string]string{
-					"RELEASE_APEX_CONTRIBUTIONS_ADSERVICES": "my_mainline_module_contribution",
-				}
-			}),
-			// use_source_config_var indicates that prebuilt should be used
-			// but this is superseded by `my_mainline_module_contribution`
-			prebuilt: nil,
-		},
-		{
-			name: "prebuilt use_source_config_var={acme, use_source} - acme_use_source=true",
-			modules: `
-				source {
-					name: "bar",
-				}
-
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}`,
-			preparer: FixtureModifyProductVariables(func(variables FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "true",
-					},
-				}
-			}),
-			// Setting the environment variable named in use_source_env to true will cause the source to be
-			// used.
-			prebuilt: nil,
-		},
-		{
-			name: "prebuilt use_source_config_var={acme, use_source} - acme_use_source=true, no source",
-			modules: `
-				prebuilt {
-					name: "bar",
-					use_source_config_var: {config_namespace: "acme", var_name: "use_source"},
-					srcs: ["prebuilt_file"],
-				}`,
-			preparer: FixtureModifyProductVariables(func(variables FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "true",
-					},
-				}
-			}),
-			// Although the environment variable says to use source there is no source available.
-			prebuilt: []OsType{Android, buildOS},
-		},
 	}
 
 	fs := MockFS{
diff --git a/java/sdk_library_test.go b/java/sdk_library_test.go
index 5fac2556d..0f163e6e0 100644
--- a/java/sdk_library_test.go
+++ b/java/sdk_library_test.go
@@ -1085,18 +1085,6 @@ func TestJavaSdkLibraryImport_Preferred(t *testing.T) {
 	t.Run("prefer", func(t *testing.T) {
 		testJavaSdkLibraryImport_Preferred(t, "prefer: true,", android.NullFixturePreparer)
 	})
-
-	t.Run("use_source_config_var", func(t *testing.T) {
-		testJavaSdkLibraryImport_Preferred(t,
-			"use_source_config_var: {config_namespace: \"acme\", var_name: \"use_source\"},",
-			android.FixtureModifyProductVariables(func(variables android.FixtureProductVariables) {
-				variables.VendorVars = map[string]map[string]string{
-					"acme": {
-						"use_source": "false",
-					},
-				}
-			}))
-	})
 }
 
 // If a module is listed in `mainline_module_contributions, it should be used