Add base:: to string16s in win8/.

win8/metro_driver/metro_dialog_box.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_METRO_DRIVER_METRO_DIALOG_BOX_H_
 #define CHROME_BROWSER_UI_METRO_DRIVER_METRO_DIALOG_BOX_H_
 
 #include <windows.ui.popups.h>
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/win/metro.h"
 
 // Provides functionality to display a dialog box
 class MetroDialogBox : public winui::Popups::IUICommandInvokedHandler {
  public:
   struct DialogBoxInfo {
-    string16 title;
-    string16 content;
-    string16 button1_label;
-    string16 button2_label;
+    base::string16 title;
+    base::string16 content;
+    base::string16 button1_label;
+    base::string16 button2_label;
     base::win::MetroDialogButtonPressedHandler button1_handler;
     base::win::MetroDialogButtonPressedHandler button2_handler;
   };
 
   MetroDialogBox();
   ~MetroDialogBox();
 
   // Displays the dialog box.
   void Show(const DialogBoxInfo& dialog_box_info);
 
@@ skipping 22 matching lines @@
   virtual HRESULT STDMETHODCALLTYPE Invoke(winui::Popups::IUICommand* command);
 
  private:
   // The actual dialog box.
   mswr::ComPtr<winui::Popups::IMessageDialog> dialog_box_;
   DialogBoxInfo dialog_box_info_;
 };
 
 #endif  // CHROME_BROWSER_UI_METRO_DRIVER_METRO_DIALOG_BOX_H_