Add implementation of WebWidgetClient::initializeLayerTreeView()

content/renderer/gpu/render_widget_compositor.h

Index: content/renderer/gpu/render_widget_compositor.h
diff --git a/content/renderer/gpu/render_widget_compositor.h b/content/renderer/gpu/render_widget_compositor.h
index 9f53fb12eb6c6e91b134cdd35f78299ed8c68365..ee69ea089caf8fa8f2cbcd7c4ae2917443aade22 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -26,9 +26,7 @@ class RenderWidgetCompositor : public WebKit::WebLayerTreeView,
  public:
   // Attempt to construct and initialize a compositor instance for the widget
   // with the given settings. Returns NULL if initialization fails.
-  static scoped_ptr<RenderWidgetCompositor> Create(
-      RenderWidget* widget,
-      WebKit::WebLayerTreeView::Settings settings);
+  static scoped_ptr<RenderWidgetCompositor> Create(RenderWidget* widget);
 
   virtual ~RenderWidgetCompositor();