Remove TODOs for merging RGB and MatrixTransformation processors.

PiperOrigin-RevId: 476362571
(cherry picked from commit af19f82f)

google3/third_party/java_src/android_libs/media/libraries/effect/src/androidTest/java/androidx/media3/effect/GlEffectsFrameProcessorPixelTest.java

@@ -388,7 +388,6 @@ public final class GlEffectsFrameProcessorPixelTest {
   }
 
   @Test
-  // TODO(b/239757183): Consider moving RgbMatrix composition tests to a new file.
   public void drawFrame_grayscaleAndIncreaseRedChannel_producesGrayscaleAndRedImage()
       throws Exception {
     String testId = "drawFrame_grayscaleAndIncreaseRedChannel";

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/GlEffectsFrameProcessor.java

@@ -167,7 +167,6 @@ public final class GlEffectsFrameProcessor implements FrameProcessor {
    *     The first is an {@link ExternalTextureProcessor} and the last is a {@link
    *     FinalMatrixTextureProcessorWrapper}.
    */
-  // TODO(b/239757183): Squash GlMatrixTransformation and RgbMatrix together.
   private static ImmutableList<GlTextureProcessor> getGlTextureProcessorsForGlEffects(
       Context context,
       List<Effect> effects,