Enable swapping a frame back in to its parent process

content/browser/frame_host/render_frame_proxy_host.h

Index: content/browser/frame_host/render_frame_proxy_host.h
diff --git a/content/browser/frame_host/render_frame_proxy_host.h b/content/browser/frame_host/render_frame_proxy_host.h
index c126aafd629947630894719d0bb513a9a2def060..47afd504626a2739b670fe41d356853cfcee9f2d 100644
--- a/content/browser/frame_host/render_frame_proxy_host.h
+++ b/content/browser/frame_host/render_frame_proxy_host.h
@@ -106,6 +106,10 @@ class RenderFrameProxyHost
   // action in another renderer process.
   void DisownOpener();
 
+  // Replace the RenderFrameProxy with a RenderFrame in preparation for moving
+  // the frame into this renderer process.
+  void SwapOut(RenderFrameHostImpl* host);
+
  private:
   // IPC Message handlers.
   void OnOpenURL(const FrameHostMsg_OpenURL_Params& params);