Add base:: to string16s in win8/.

win8/metro_driver/chrome_app_view.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 WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_
 #define WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_
 
 #include <windows.applicationmodel.core.h>
 #include <windows.ui.core.h>
 #include <windows.ui.input.h>
@@ skipping 137 matching lines @@
 struct Globals {
   LPTHREAD_START_ROUTINE host_main;
   void* host_context;
   // The pair below contains the HWND and a bool which indicates whether the
   // window was displaced to ensure that the focused region is visible when
   // the OSK is displayed.
   std::list<std::pair<HWND, bool> > host_windows;
   HANDLE host_thread;
   ChromeAppView* view;
   WNDPROC g_core_proc;
-  string16 navigation_url;
-  string16 search_string;
+  base::string16 navigation_url;
+  base::string16 search_string;
   winapp::Activation::ApplicationExecutionState previous_state;
   winapp::Activation::ActivationKind initial_activation_kind;
   bool is_initial_activation;
   // This message loop lives in the app view's thread. Some operations have
   // to be initiated from that thread, notably spawning file pickers.
   base::MessageLoopProxy* appview_msg_loop;
   winapp::Core::ICoreApplicationExit* app_exit;
-  string16 metro_command_line_switches;
+  base::string16 metro_command_line_switches;
 };
 
 extern Globals globals;
 
 #endif  // WIN8_METRO_DRIVER_CHROME_APP_VIEW_H_