Remove TabContents from TabStripModelObserver::TabReplacedAt.

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/views/tabs/browser_tab_strip_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/tab_helper.h"
@@ skipping 393 matching lines @@
   if (change_type == TITLE_NOT_LOADING) {
     tabstrip_->TabTitleChangedNotLoading(model_index);
     // We'll receive another notification of the change asynchronously.
     return;
   }
 
   SetTabDataAt(contents, model_index);
 }
 
 void BrowserTabStripController::TabReplacedAt(TabStripModel* tab_strip_model,
-                                              TabContents* old_contents,
-                                              TabContents* new_contents,
+                                              WebContents* old_contents,
+                                              WebContents* new_contents,
                                               int model_index) {
-  SetTabDataAt(new_contents->web_contents(), model_index);
+  SetTabDataAt(new_contents, model_index);
 }
 
 void BrowserTabStripController::TabPinnedStateChanged(WebContents* contents,
                                                       int model_index) {
   // Currently none of the renderers render pinned state differently.
 }
 
 void BrowserTabStripController::TabMiniStateChanged(WebContents* contents,
                                                     int model_index) {
   SetTabDataAt(contents, model_index);
@@ skipping 86 matching lines @@
   SetTabRendererDataFromModel(contents, index, &data, NEW_TAB);
   tabstrip_->AddTabAt(index, data, is_active);
 }
 
 void BrowserTabStripController::UpdateLayoutType() {
   bool adjust_layout = false;
   TabStripLayoutType layout_type =
       DetermineTabStripLayout(g_browser_process->local_state(), &adjust_layout);
   tabstrip_->SetLayoutType(layout_type, adjust_layout);
 }