Remove surface_id from RenderWidget/RenderWidgetHost and friends

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 610a0b5f4f2c148c490bfdcdd2aa3f2f5058e060..1e7a3b9698398f033ba8e26a4a1580e563ec1d7f 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -112,7 +112,6 @@ class CONTENT_EXPORT RenderWidget
 
   // Creates a new RenderWidget that will be attached to a RenderFrame.
   static RenderWidget* CreateForFrame(int routing_id,
-                                      int surface_id,
                                       bool hidden,
                                       const blink::WebScreenInfo& screen_info,
                                       CompositorDependencies* compositor_deps,
@@ -122,7 +121,6 @@ class CONTENT_EXPORT RenderWidget
   void CloseForFrame();
 
   int32 routing_id() const { return routing_id_; }
-  int32 surface_id() const { return surface_id_; }
   CompositorDependencies* compositor_deps() const { return compositor_deps_; }
   blink::WebWidget* webwidget() const { return webwidget_; }
   gfx::Size size() const { return size_; }
@@ -591,8 +589,6 @@ class CONTENT_EXPORT RenderWidget
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
-  int32 surface_id_;
-
   // Dependencies for initializing a compositor, including flags for optional
   // features.
   CompositorDependencies* const compositor_deps_;