Revert "Plumb PinchVirtualViewport layers into CC."

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index ba91e119df1a95545d9cfd7f1a388923fc4f4ae4..5211ac89d1bb2d445776c0d7612ed602e894ff76 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -201,10 +201,6 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   void SetRootLayer(scoped_refptr<Layer> root_layer);
   Layer* root_layer() { return root_layer_.get(); }
   const Layer* root_layer() const { return root_layer_.get(); }
-  void RegisterViewportLayers(
-      scoped_refptr<Layer> page_scale_layer,
-      scoped_refptr<Layer> inner_viewport_scroll_layer,
-      scoped_refptr<Layer> outer_viewport_scroll_layer);
 
   const LayerTreeSettings& settings() const { return settings_; }
 
@@ -423,10 +419,6 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   LCDTextMetrics lcd_text_metrics_;
   int tree_id_;
 
-  scoped_refptr<Layer> page_scale_layer_;
-  scoped_refptr<Layer> inner_viewport_scroll_layer_;
-  scoped_refptr<Layer> outer_viewport_scroll_layer_;
-
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };