[Chromecast] Remove use of VIDEO_HOLE

chromecast/media/cma/filters/hole_frame_factory.h

Index: chromecast/media/cma/filters/hole_frame_factory.h
diff --git a/chromecast/media/cma/filters/hole_frame_factory.h b/chromecast/media/cma/filters/hole_frame_factory.h
index e817a3e93f3062dcbd6a8465dfb8c4a47e41a69e..c77fb6be8dfee2d8e04d01e3bc64998903c0708d 100644
--- a/chromecast/media/cma/filters/hole_frame_factory.h
+++ b/chromecast/media/cma/filters/hole_frame_factory.h
@@ -22,9 +22,8 @@ class VideoFrame;
 namespace chromecast {
 namespace media {
 
-// Creates VideoFrames for CMA - currently supports both overlay frames
-// (native textures that get turned into transparent holes in the browser
-// compositor), and legacy VIDEO_HOLE codepath.
+// Creates VideoFrames for CMA - native textures that get turned into
+// transparent holes in the browser compositor using overlay system.
 // All calls (including ctor/dtor) must be on media thread.
 class HoleFrameFactory {
  public:
@@ -40,7 +39,6 @@ class HoleFrameFactory {
   GLuint texture_;
   GLuint image_id_;
   GLuint sync_point_;
-  bool use_legacy_hole_punching_;
 
   DISALLOW_COPY_AND_ASSIGN(HoleFrameFactory);
 };