Add base:: namespace to straggling string16s left in chrome/browser/ui.

chrome/browser/ui/browser.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_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 426 matching lines @@
   virtual bool PreHandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event,
       bool* is_keyboard_shortcut) OVERRIDE;
   virtual void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual void OverscrollUpdate(int delta_y) OVERRIDE;
   virtual void ShowValidationMessage(content::WebContents* web_contents,
                                      const gfx::Rect& anchor_in_root_view,
-                                     const string16& main_text,
-                                     const string16& sub_text) OVERRIDE;
+                                     const base::string16& main_text,
+                                     const base::string16& sub_text) OVERRIDE;
   virtual void HideValidationMessage(
       content::WebContents* web_contents) OVERRIDE;
   virtual void MoveValidationMessage(
       content::WebContents* web_contents,
       const gfx::Rect& anchor_in_root_view) OVERRIDE;
 
   bool is_type_tabbed() const { return type_ == TYPE_TABBED; }
   bool is_type_popup() const { return type_ == TYPE_POPUP; }
 
   bool is_app() const;
@@ skipping 468 matching lines @@
   base::WeakPtrFactory<Browser> weak_factory_;
 
   scoped_ptr<BrowserLanguageStateObserver> language_state_observer_;
 
   scoped_ptr<chrome::ValidationMessageBubble> validation_message_bubble_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_