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

chrome/browser/back_forward_menu_model.h

 // Copyright (c) 2006-2008 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_H_
 #define CHROME_BROWSER_BACK_FORWARD_MENU_MODEL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/string16.h"
 
 class Browser;
 class SkBitmap;
 class TabContents;
 class NavigationEntry;
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // BackForwardMenuModel
 //
@@ skipping 64 matching lines @@
   int FindChapterStop(int offset, bool forward, int skip) const;
 
   // Execute the command associated with |menu_id|.
   void ExecuteCommandById(int menu_id);
 
   // Is the item at |menu_id| a separator?
   bool IsSeparator(int menu_id) const;
 
   // Get the display text for the item. This should not be called on a
   // separator.
-  std::wstring GetItemLabel(int menu_id) const;
+  string16 GetItemLabel(int menu_id) const;
 
   // Get the display icon for the item. This should not be called on a
   // separator or an item that does not have an icon.
   const SkBitmap& GetItemIcon(int menu_id) const;
 
   // Returns true if there is an icon for this menu item.
   bool ItemHasIcon(int menu_id) const;
 
   // Does the item does something when you click on it?
   bool ItemHasCommand(int menu_id) const;
@@ skipping 42 matching lines @@
 
   // Represents whether this is the delegate for the forward button or the
   // back button.
   ModelType model_type_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BackForwardMenuModel);
 };
 
 #endif  // CHROME_BROWSER_BACK_FORWARD_MENU_MODEL_H_