Convert menu strings to UTF16, fix some views-GTK build errors.

chrome/browser/back_forward_menu_model_views.h

 // Copyright (c) 2006-2009 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_BACK_FORWARD_MENU_MODEL_VIEWS_H_
 #define CHROME_BROWSER_BACK_FORWARD_MENU_MODEL_VIEWS_H_
 
 #include "base/basictypes.h"
 
 #include "chrome/browser/back_forward_menu_model.h"
@@ skipping 12 matching lines @@
   // for the history item.
   BackForwardMenuModelViews(Browser* browser,
                             ModelType model_type,
                             views::Widget* frame);
 
   // Overridden from views::Menu2Model:
   virtual bool HasIcons() const;
   virtual int GetItemCount() const;
   virtual ItemType GetTypeAt(int index) const;
   virtual int GetCommandIdAt(int index) const;
-  virtual std::wstring GetLabelAt(int index) const;
+  virtual string16 GetLabelAt(int index) const;
   virtual bool IsLabelDynamicAt(int index) const;
   virtual bool GetAcceleratorAt(int index,
                                 views::Accelerator* accelerator) const;
   virtual bool IsItemCheckedAt(int index) const;
   virtual int GetGroupIdAt(int index) const;
   virtual bool GetIconAt(int index, SkBitmap* icon) const;
   virtual bool IsEnabledAt(int index) const;
   virtual Menu2Model* GetSubmenuModelAt(int index) const;
   virtual void HighlightChangedTo(int index);
   virtual void ActivatedAt(int index);
   virtual void MenuWillShow();
 
  private:
   // The frame we ask about accelerator info.
   views::Widget* frame_;
 
   DISALLOW_COPY_AND_ASSIGN(BackForwardMenuModelViews);
 };
 
 #endif  // CHROME_BROWSER_BACK_FORWARD_MENU_MODEL_VIEWS_H_