Remove .mk lines that are just setting the default

1.8 is now the default unless targeting an old SDK.

Bug: 31944681
Test: make checkbuild
Change-Id: Ic8a50cfd332da8b84eb87207a3c2d2c9a9a58e99
diff --git a/core/tests/systemproperties/Android.mk b/core/tests/systemproperties/Android.mk
index ffc1282..e16c367 100644
--- a/core/tests/systemproperties/Android.mk
+++ b/core/tests/systemproperties/Android.mk
@@ -11,7 +11,6 @@
 LOCAL_STATIC_JAVA_LIBRARIES := android-common frameworks-core-util-lib
 LOCAL_JAVA_LIBRARIES := android.test.runner
 LOCAL_PACKAGE_NAME := FrameworksCoreSystemPropertiesTests
-LOCAL_JAVA_LANGUAGE_VERSION := 1.8
 
 LOCAL_CERTIFICATE := platform
 
diff --git a/media/tests/MediaFrameworkTest/Android.mk b/media/tests/MediaFrameworkTest/Android.mk
index 7e438a1..29557be 100644
--- a/media/tests/MediaFrameworkTest/Android.mk
+++ b/media/tests/MediaFrameworkTest/Android.mk
@@ -7,8 +7,6 @@
 
 LOCAL_JAVA_LIBRARIES := android.test.runner
 
-LOCAL_JAVA_LANGUAGE_VERSION := 1.8
-
 LOCAL_STATIC_JAVA_LIBRARIES := easymocklib \
     mockito-target \
     android-support-test \