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

content/browser/tab_contents/tab_contents_delegate.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/tab_contents/tab_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/browser/javascript_dialogs.h"
@@ skipping 44 matching lines @@
 
 void TabContentsDelegate::LoadingStateChanged(TabContents* source) {
 }
 
 void TabContentsDelegate::LoadProgressChanged(double progress) {
 }
 
 void TabContentsDelegate::CloseContents(TabContents* source) {
 }
 
+void TabContentsDelegate::SwappedOut(TabContents* source) {
+}
+
 void TabContentsDelegate::MoveContents(TabContents* source,
                                        const gfx::Rect& pos) {
 }
 
 void TabContentsDelegate::DetachContents(TabContents* source) {
 }
 
 bool TabContentsDelegate::IsPopupOrPanel(const TabContents* source) const {
   return false;
 }
@@ skipping 278 matching lines @@
   attached_contents_.insert(tab_contents);
 }
 
 void TabContentsDelegate::Detach(TabContents* tab_contents) {
   DCHECK(attached_contents_.find(tab_contents) != attached_contents_.end());
   attached_contents_.erase(tab_contents);
 }
 
 void TabContentsDelegate::LostMouseLock() {
 }