Changed the extension.connect() API not to broadcast to all tabs. Added a

chrome/browser/renderer_host/render_widget_host.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 
 #include <queue>
 #include <vector>
 
@@ skipping 97 matching lines @@
 // to it (the TabContents does not).
 //
 // It should be noted that the RenderViewHost, not the RenderWidgetHost,
 // handles IPC messages relating to the render process going away, since the
 // way a RenderViewHost (TabContents) handles the process dying is different to
 // the way a select popup does. As such the RenderWidgetHostView handles these
 // messages for select popups. This placement is more out of convenience than
 // anything else. When the view is live, these messages are forwarded to it by
 // the RenderWidgetHost's IPC message map.
 //
-class RenderWidgetHost : public IPC::Channel::Listener {
+class RenderWidgetHost : public IPC::Channel::Listener,
+                         public IPC::Channel::Sender {
  public:
   // An interface that gets called whenever a paint occurs.
   // Used in performance tests.
   class PaintObserver {
    public:
     virtual ~PaintObserver() {}
     virtual void RenderWidgetHostDidPaint(RenderWidgetHost* rwh) = 0;
   };
 
   // routing_id can be MSG_ROUTING_NONE, in which case the next available
@@ skipping 382 matching lines @@
 
   // Set when we cancel updating the text direction.
   // This flag also ignores succeeding update requests until we call
   // NotifyTextDirection().
   bool text_direction_canceled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_