Add SwappedOut to TabContentsDelegate to allow us to correctly delete TabContents.

content/browser/renderer_host/render_view_host_delegate.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 233 matching lines @@
   // The page's encoding was changed and should be updated.
   virtual void UpdateEncoding(RenderViewHost* render_view_host,
                               const std::string& encoding) {}
 
   // The destination URL has changed should be updated
   virtual void UpdateTargetURL(int32 page_id, const GURL& url) {}
 
   // The page is trying to close the RenderView's representation in the client.
   virtual void Close(RenderViewHost* render_view_host) {}
 
+  // The RenderViewHost has been swapped out.
+  virtual void SwappedOut(RenderViewHost* render_view_host) {}
+
   // The page is trying to move the RenderView's representation in the client.
   virtual void RequestMove(const gfx::Rect& new_bounds) {}
 
   // The RenderView began loading a new page. This corresponds to WebKit's
   // notion of the throbber starting.
   virtual void DidStartLoading() {}
 
   // The RenderView stopped loading a page. This corresponds to WebKit's
   // notion of the throbber stopping.
   virtual void DidStopLoading() {}
@@ skipping 125 matching lines @@
   virtual void RequestToLockMouse() {}
 
   // Notification that the view has lost the mouse lock.
   virtual void LostMouseLock() {}
 
  protected:
   virtual ~RenderViewHostDelegate() {}
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_