Remove TabContents from TabStripModelObserver::TabReplacedAt.

chrome/browser/ui/ash/launcher/browser_launcher_item_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/ash/launcher/browser_launcher_item_controller.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
@@ skipping 191 matching lines @@
       !(change_type != TabStripModelObserver::LOADING_ONLY &&
         change_type != TabStripModelObserver::TITLE_NOT_LOADING)) {
     return;
   }
 
   UpdateLauncher(contents);
 }
 
 void BrowserLauncherItemController::TabReplacedAt(
     TabStripModel* tab_strip_model,
-    TabContents* old_contents,
-    TabContents* new_contents,
+    content::WebContents* old_contents,
+    content::WebContents* new_contents,
     int index) {
   launcher_controller()->UpdateAppState(
-      old_contents->web_contents(),
+      old_contents,
       ChromeLauncherController::APP_STATE_REMOVED);
-  UpdateAppState(new_contents->web_contents());
+  UpdateAppState(new_contents);
 }
 
 void BrowserLauncherItemController::FaviconUpdated() {
   UpdateLauncher(tab_model_->GetActiveWebContents());
 }
 
 void BrowserLauncherItemController::OnWindowPropertyChanged(
     aura::Window* window,
     const void* key,
     intptr_t old) {
@@ skipping 73 matching lines @@
       app_state = ChromeLauncherController::APP_STATE_ACTIVE;
   } else {
     app_state = ChromeLauncherController::APP_STATE_INACTIVE;
   }
   launcher_controller()->UpdateAppState(tab, app_state);
 }
 
 ash::LauncherModel* BrowserLauncherItemController::launcher_model() {
   return launcher_controller()->model();
 }