Coverity: Fix bad overrides.

chrome/browser/sidebar/sidebar_container.h

 // Copyright (c) 2010 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_SIDEBAR_SIDEBAR_CONTAINER_H_
 #define CHROME_BROWSER_SIDEBAR_SIDEBAR_CONTAINER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 87 matching lines @@
   virtual void AddNewContents(TabContents* source,
                               TabContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) {}
   virtual void ActivateContents(TabContents* contents) {}
   virtual void DeactivateContents(TabContents* contents) {}
   virtual void LoadingStateChanged(TabContents* source) {}
   virtual void CloseContents(TabContents* source) {}
   virtual void MoveContents(TabContents* source, const gfx::Rect& pos) {}
-  virtual bool IsPopup(TabContents* source) { return false; }
+  virtual bool IsPopup(TabContents* source) const { return false; }
   virtual void URLStarredChanged(TabContents* source, bool starred) {}
   virtual void UpdateTargetURL(TabContents* source, const GURL& url) {}
   virtual void ToolbarSizeChanged(TabContents* source, bool is_animating) {}
 
   // Contents of the tab this sidebar is linked to.
   TabContents* tab_;
 
   // Sidebar's content id. There might be more than one sidebar liked to each
   // particular tab and they are identified by their unique content id.
   const std::string content_id_;
@@ skipping 11 matching lines @@
   scoped_ptr<SkBitmap> icon_;
 
   // Sidebar's title, displayed as a tooltip for sidebar's mini tab.
   string16 title_;
 
   DISALLOW_COPY_AND_ASSIGN(SidebarContainer);
 };
 
 #endif  // CHROME_BROWSER_SIDEBAR_SIDEBAR_CONTAINER_H_