Support cross-process window.close() messages.

content/public/browser/render_view_host_delegate.h

Index: content/public/browser/render_view_host_delegate.h
diff --git a/content/public/browser/render_view_host_delegate.h b/content/public/browser/render_view_host_delegate.h
index 31251b52a6a54fc4249b85cf2ead4494d450272a..5b988cf2c381d441b33cd13027b8f8be546d6954 100644
--- a/content/public/browser/render_view_host_delegate.h
+++ b/content/public/browser/render_view_host_delegate.h
@@ -297,6 +297,9 @@ class CONTENT_EXPORT RenderViewHostDelegate : public IPC::Channel::Listener {
       int64 source_frame_id,
       const content::GlobalRequestID& old_request_id) {}
 
+  // The page wants to close the active view in this tab.
+  virtual void RouteCloseEvent(RenderViewHost* rvh) {}
+
   // A javascript message, confirmation or prompt should be shown.
   virtual void RunJavaScriptMessage(RenderViewHost* rvh,
                                     const string16& message,