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

content/browser/renderer_host/render_view_host.cc

 // 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.
 
 #include "content/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 330 matching lines @@
     // event.  We must notify the ResourceDispatcherHost on the IO thread,
     // which we will do through the RenderProcessHost's widget helper.
     process()->CrossSiteSwapOutACK(params);
   }
 }
 
 void RenderViewHost::OnSwapOutACK() {
   // Stop the hang monitor now that the unload handler has finished.
   StopHangMonitorTimeout();
   is_waiting_for_unload_ack_ = false;
+  delegate_->SwappedOut(this);
 }
 
 void RenderViewHost::WasSwappedOut() {
   // Don't bother reporting hung state anymore.
   StopHangMonitorTimeout();
 
   // Inform the renderer that it can exit if no one else is using it.
   Send(new ViewMsg_WasSwappedOut(routing_id()));
 }
 
@@ skipping 1137 matching lines @@
 
 void RenderViewHost::OnWebUISend(const GURL& source_url,
                                  const std::string& name,
                                  const base::ListValue& args) {
   delegate_->WebUISend(this, source_url, name, args);
 }
 
 void RenderViewHost::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }