Switch SearchTabHelper to use WebContentsUserData.

chrome/browser/ui/search/search_model.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_SEARCH_SEARCH_MODEL_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_MODEL_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "chrome/browser/ui/search/search_types.h"
 
-class TabContents;
-
 namespace content {
 class WebContents;
 }
 
 namespace chrome {
 namespace search {
 
 class SearchModelObserver;
 
 // An observable model for UI components that care about search model state
 // changes.
 class SearchModel {
  public:
-  explicit SearchModel(TabContents* contents);
+  explicit SearchModel(content::WebContents* web_contents);
   ~SearchModel();
 
   // Change the mode.  Change notifications are sent to observers.  An animated
   // transition may be requested.
   void SetMode(const Mode& mode);
 
   // Get the active mode.
   const Mode& mode() const { return mode_; }
 
   // Add and remove observers.
   void AddObserver(SearchModelObserver* observer);
   void RemoveObserver(SearchModelObserver* observer);
 
   // This can be NULL if this is the browser model and it's accessed during
   // startup or shutdown.
-  const TabContents* tab_contents() const {
-    return contents_;
+  const content::WebContents* web_contents() const {
+    return web_contents_;
   }
 
-  void set_tab_contents(TabContents* contents) {
-    contents_ = contents;
+  void set_web_contents(content::WebContents* web_contents) {
+    web_contents_ = web_contents;
   }
 
  private:
   // The display mode of UI elements such as the toolbar, the tab strip, etc.
   Mode mode_;
 
   // Weak. Used to access current profile to determine incognito status.
-  TabContents* contents_;
+  content::WebContents* web_contents_;
 
   // Observers.
   ObserverList<SearchModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchModel);
 };
 
 }  // namespace search
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_MODEL_H_