Decouple RVH creation from CrossProcessFrameConnector.

content/browser/frame_host/cross_process_frame_connector.h

Index: content/browser/frame_host/cross_process_frame_connector.h
diff --git a/content/browser/frame_host/cross_process_frame_connector.h b/content/browser/frame_host/cross_process_frame_connector.h
index 4a940879f4c42c46d2b0289f04c7629d9608f8c5..b3d87a4c4d512a01c6349f296117f479955632fb 100644
--- a/content/browser/frame_host/cross_process_frame_connector.h
+++ b/content/browser/frame_host/cross_process_frame_connector.h
@@ -101,6 +101,9 @@ class CrossProcessFrameConnector {
   void OnForwardInputEvent(const blink::WebInputEvent* event);
   void OnInitializeChildFrame(gfx::Rect frame_rect, float scale_factor);
 
+  void SetDeviceScaleFactor(float scale_factor);
+  void SetSize(gfx::Rect frame_rect);
+
   // The RenderFrameHost that routes messages to the parent frame's renderer
   // process.
   // TODO(kenrb): The type becomes RenderFrameProxyHost when that class comes