Remove empty default constructor

Unused. Initially added to ease mocking/inheritance for testing
purposes, but apparently not necessary because a package-private
default constructor is auto-generated.

Also make fields final.

Bug: 123600502
Test: atest cts/tests/tests/os/src/android/os/cts/BuildVersionTest.java
Change-Id: I123a19fd0760259db67344bb827c0cf2de3b85c3

2 files changed, 3 insertions, 6 deletions

diff --git a/api/current.txt b/api/current.txt
index ad321c6288b3..55025e7d0661 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -34199,7 +34199,6 @@ package android.os {
   }
 
   public static class Build.Partition {
-    ctor public Build.Partition();
     method public long getBuildTimeMillis();
     method @NonNull public String getFingerprint();
     method @NonNull public String getName();
diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index 2d61a4ee95d9..83a7654d494b 100755
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -1120,11 +1120,9 @@ public class Build {
         /** The name identifying the system partition. */
         public static final String PARTITION_NAME_SYSTEM = "system";
 
-        private String mName;
-        private String mFingerprint;
-        private long mTimeMs;
-
-        public Partition() {}
+        private final String mName;
+        private final String mFingerprint;
+        private final long mTimeMs;
 
         private Partition(String name, String fingerprint, long timeMs) {
             mName = name;