Refactor postMessage for out-of-process iframes.

content/renderer/render_frame_proxy.h

Index: content/renderer/render_frame_proxy.h
diff --git a/content/renderer/render_frame_proxy.h b/content/renderer/render_frame_proxy.h
index 65352cf5fb3421c0db236ad279a7a0501f8e5a88..19a94f682064e763dbe53d4b84ac1374b08e08b9 100644
--- a/content/renderer/render_frame_proxy.h
+++ b/content/renderer/render_frame_proxy.h
@@ -100,6 +100,12 @@ class CONTENT_EXPORT RenderFrameProxy
   // RenderFrameProxy's WebRemoteFrame.
   void SetReplicatedState(const FrameReplicationState& state);
 
+  // Navigating a top-level frame cross-process does not swap the WebLocalFrame
+  // for a WebRemoteFrame in the frame tree. In this case, this WebRemoteFrame
+  // is not attached to the frame tree and there is no blink::Frame associated
+  // with it, so it is not in state where most operations on it will succeed.
+  bool IsMainFrameDetachedFromTree() const;
+
   int routing_id() { return routing_id_; }
   RenderViewImpl* render_view() { return render_view_; }
   blink::WebRemoteFrame* web_frame() { return web_frame_; }
@@ -126,12 +132,6 @@ class CONTENT_EXPORT RenderFrameProxy
 
   void Init(blink::WebRemoteFrame* frame, RenderViewImpl* render_view);
 
-  // Navigating a top-level frame cross-process does not swap the WebLocalFrame
-  // for a WebRemoteFrame in the frame tree. In this case, this WebRemoteFrame
-  // is not attached to the frame tree and there is no blink::Frame associated
-  // with it, so it is not in state where most operations on it will succeed.
-  bool IsMainFrameDetachedFromTree() const;
-
   // IPC::Listener
   bool OnMessageReceived(const IPC::Message& msg) override;