Remove TabContents from TabStripModelObserver::ActiveTabChanged.

chrome/browser/ui/tabs/tab_strip_model_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 
 class TabContents;
 class TabStripModel;
 class TabStripSelectionModel;
@@ skipping 60 matching lines @@
   // the index of |new_contents|. |user_gesture| specifies whether or not this
   // was done by a user input event (e.g. clicking on a tab, keystroke) or as a
   // side-effect of some other function.
   // Note: It is possible for the selection to change while the active tab
   // remains unchanged. For example, control-click may not change the active tab
   // but does change the selection. In this case |ActiveTabChanged| is not sent.
   // If you care about any changes to the selection, override
   // TabSelectionChanged.
   // Note: |old_contents| will be NULL if there was no contents previously
   // active.
-  virtual void ActiveTabChanged(TabContents* old_contents,
-                                TabContents* new_contents,
+  virtual void ActiveTabChanged(content::WebContents* old_contents,
+                                content::WebContents* new_contents,
                                 int index,
                                 bool user_gesture);
 
   // Sent when the selection changes in |tab_strip_model|. More precisely when
   // selected tabs, anchor tab or active tab change. |old_model| is a snapshot
   // of the selection model before the change. See also ActiveTabChanged for
   // details.
   virtual void TabSelectionChanged(TabStripModel* tab_strip_model,
                                    const TabStripSelectionModel& old_model);
 
@@ skipping 42 matching lines @@
 
   // Sent when the tabstrip model is about to be deleted and any reference held
   // must be dropped.
   virtual void TabStripModelDeleted();
 
  protected:
   virtual ~TabStripModelObserver() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_OBSERVER_H_