Add base:: to string16s in win8/.

win8/metro_driver/ime/text_store.h

 // Copyright 2013 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 WIN8_METRO_DRIVER_IME_TEXT_STORE_H_
 #define WIN8_METRO_DRIVER_IME_TEXT_STORE_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <initguid.h>
@@ skipping 243 matching lines @@
   // The current mask of |text_store_acp_sink_|.
   DWORD text_store_acp_sink_mask_;
 
   // HWND of the attached window.
   HWND window_handle_;
 
   //  |string_buffer_| contains committed string and composition string.
   //  Example: "aoi" is committed, and "umi" is under composition.
   //    |string_buffer_|: "aoiumi"
   //    |committed_size_|: 3
-  string16 string_buffer_;
+  base::string16 string_buffer_;
   uint32 committed_size_;
 
   //  |selection_start_| and |selection_end_| indicates the selection range.
   //  Example: "iue" is selected
   //    |string_buffer_|: "aiueo"
   //    |selection_start_|: 1
   //    |selection_end_|: 4
   uint32 selection_start_;
   uint32 selection_end_;
 
@@ skipping 31 matching lines @@
 
   // The delegate attached to this text store.
   TextStoreDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TextStore);
 };
 
 }  // namespace metro_driver
 
 #endif  // WIN8_METRO_DRIVER_IME_TEXT_STORE_H_