[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/picture_layer_impl.h

Index: cc/picture_layer_impl.h
diff --git a/cc/picture_layer_impl.h b/cc/picture_layer_impl.h
index 8b1e4ebdca6cfe871e4ae7f05dd2a496dc2e09b3..2370150f82c0b1d489d394593c734d53e2dcd564 100644
--- a/cc/picture_layer_impl.h
+++ b/cc/picture_layer_impl.h
@@ -19,9 +19,9 @@ class QuadSink;
 class CC_EXPORT PictureLayerImpl : public LayerImpl,
                                    public PictureLayerTilingClient {
 public:
-  static scoped_ptr<PictureLayerImpl> create(LayerTreeHostImpl* host, int id)
+  static scoped_ptr<PictureLayerImpl> create(LayerTreeImpl* treeImpl, int id)
   {
-      return make_scoped_ptr(new PictureLayerImpl(host, id));
+      return make_scoped_ptr(new PictureLayerImpl(treeImpl, id));
   }
   virtual ~PictureLayerImpl();
 
@@ -39,7 +39,7 @@ public:
   void SyncFromActiveLayer(const PictureLayerImpl* other);
 
 protected:
-  PictureLayerImpl(LayerTreeHostImpl* host, int id);
+  PictureLayerImpl(LayerTreeImpl* treeImpl, int id);
 
   PictureLayerTilingSet tilings_;
   scoped_refptr<PicturePileImpl> pile_;