Remove const LayerImpl* from QuadSink

cc/test/mock_quad_culler.cc

Index: cc/test/mock_quad_culler.cc
diff --git a/cc/test/mock_quad_culler.cc b/cc/test/mock_quad_culler.cc
index 6a2baa4119ff67a35ef49fefa3eea7988dc007cc..d716fb5e09630135c5235a847650afec90d9a7e2 100644
--- a/cc/test/mock_quad_culler.cc
+++ b/cc/test/mock_quad_culler.cc
@@ -9,24 +9,26 @@ namespace cc {
 MockQuadCuller::MockQuadCuller(
     RenderPass* render_pass,
     MockOcclusionTracker<LayerImpl>* occlusion_tracker)
-    : QuadSink(render_pass, NULL, occlusion_tracker),
+    : QuadSink(render_pass, occlusion_tracker),
       occlusion_tracker_(occlusion_tracker) {
 }
 
 MockQuadCuller::~MockQuadCuller() {}
 
 gfx::Rect MockQuadCuller::UnoccludedContentRect(
+    const LayerImpl* layer,
     const gfx::Rect& content_rect,
     const gfx::Transform& draw_transform) {
   return occlusion_tracker_->UnoccludedContentRect(
-      layer_, content_rect, draw_transform);
+      layer, content_rect, draw_transform);
 }
 
 gfx::Rect MockQuadCuller::UnoccludedContributingSurfaceContentRect(
+    const LayerImpl* layer,
     const gfx::Rect& content_rect,
     const gfx::Transform& draw_transform) {
   return occlusion_tracker_->UnoccludedContributingSurfaceContentRect(
-      layer_, content_rect, draw_transform);
+      layer, content_rect, draw_transform);
 }
 
 }  // namespace cc