Remove const LayerImpl* from QuadSink

cc/test/mock_quad_culler.h

Index: cc/test/mock_quad_culler.h
diff --git a/cc/test/mock_quad_culler.h b/cc/test/mock_quad_culler.h
index 93da726d4ad1e0fb101cc9334b8bf954cdccf8b0..a60e20835aa1dbb6bfd55a8890c47d6c24536309 100644
--- a/cc/test/mock_quad_culler.h
+++ b/cc/test/mock_quad_culler.h
@@ -22,10 +22,12 @@ class MockQuadCuller : public QuadSink {
                  MockOcclusionTracker<LayerImpl>* occlusion_tracker);
 
   virtual gfx::Rect UnoccludedContentRect(
+      const LayerImpl* layer,
       const gfx::Rect& content_rect,
       const gfx::Transform& draw_transform) OVERRIDE;
 
   virtual gfx::Rect UnoccludedContributingSurfaceContentRect(
+      const LayerImpl* layer,
       const gfx::Rect& content_rect,
       const gfx::Transform& draw_transform) OVERRIDE;
 
@@ -44,8 +46,6 @@ class MockQuadCuller : public QuadSink {
         occluded);
   }
 
-  void set_layer(const LayerImpl* layer) { layer_ = layer; }
-
   void clear_lists() {
     render_pass_->quad_list.clear();
     render_pass_->shared_quad_state_list.clear();