cc: Cleanup class/struct forward declarations

cc/output/compositor_frame_sink.h

Index: cc/output/compositor_frame_sink.h
diff --git a/cc/output/compositor_frame_sink.h b/cc/output/compositor_frame_sink.h
index 1cd1966188b7fcb17e969b91e58586a0541a6c9c..333363fdc761f2eeea9b5c9dfde05344ae7d91f9 100644
--- a/cc/output/compositor_frame_sink.h
+++ b/cc/output/compositor_frame_sink.h
@@ -19,17 +19,6 @@
 #include "gpu/command_buffer/common/texture_in_use_response.h"
 #include "ui/gfx/color_space.h"
 
-namespace ui {
-class LatencyInfo;
-}
-
-namespace gfx {
-class ColorSpace;
-class Rect;
-class Size;
-class Transform;
-}
-
 namespace gpu {
 class GpuMemoryBufferManager;
 }
@@ -37,7 +26,6 @@ class GpuMemoryBufferManager;
 namespace cc {
 
 class CompositorFrame;
-struct ManagedMemoryPolicy;
 class CompositorFrameSinkClient;
 class SharedBitmapManager;