Remove all traces of compositing reasons from cc

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index f0bca17f47c4b50885199d8baba41b2578ce0b16..46b32335b635791e314fd6895055f6a887414ec1 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -18,7 +18,6 @@
 #include "cc/base/region.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/debug/micro_benchmark.h"
-#include "cc/layers/compositing_reasons.h"
 #include "cc/layers/draw_properties.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/layers/layer_position_constraint.h"
@@ -368,8 +367,6 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
 
   void SetLayerClient(LayerClient* client) { client_ = client; }
 
-  void SetCompositingReasons(CompositingReasons reasons);
-
   virtual void PushPropertiesTo(LayerImpl* layer);
 
   void CreateRenderSurface();
@@ -594,7 +591,6 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   gfx::PointF position_;
   gfx::PointF anchor_point_;
   SkColor background_color_;
-  CompositingReasons compositing_reasons_;
   float opacity_;
   SkXfermode::Mode blend_mode_;
   FilterOperations filters_;