Frameworks: Remove bogus test method

It's tripping Errorprone's JUnit3 test pattern.

Bug: 73797534
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: Ib0b9b342e085ba640d60e82ebd9a1bbb4fc4e916

tests/SurfaceComposition/src/android/surfacecomposition/SurfaceCompositionTest.java

@@ -66,9 +66,6 @@ public class SurfaceCompositionTest extends
         super(SurfaceCompositionMeasuringActivity.class);
     }
 
-    private void testRestoreContexts() {
-    }
-
     @SmallTest
     public void testSurfaceCompositionPerformance() {
         Bundle status = new Bundle();