Add base:: to string16s in win8/.

win8/metro_driver/winrt_utils.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_WINRT_UTILS_H_
 #define WIN8_METRO_DRIVER_WINRT_UTILS_H_
 
 #include <string>
 
 #include <roapi.h>
 #include <windows.applicationmodel.core.h>
 
 #include "base/strings/string16.h"
 
 void CheckHR(HRESULT hr, const char* str = nullptr);
 
-HSTRING MakeHString(const string16& str);
+HSTRING MakeHString(const base::string16& str);
 
-string16 MakeStdWString(HSTRING hstring);
+base::string16 MakeStdWString(HSTRING hstring);
 
 namespace winrt_utils {
 
 template<unsigned int size, typename T>
 HRESULT CreateActivationFactory(wchar_t const (&class_name)[size], T** object) {
   mswrw::HStringReference ref_class_name(class_name);
   return winfoundtn::GetActivationFactory(ref_class_name.Get(), object);
 }
 
 #define DECLARE_CREATE_PROPERTY(Name, Type) \
@@ skipping 16 matching lines @@
 // +1 if |lhs| is greater than |rhs|.
 HRESULT CompareProperties(
     winfoundtn::IPropertyValue* lhs, winfoundtn::IPropertyValue* rhs,
     INT32* result);
 
 // Looks for a pinned taskbar shortcut in the current user's profile. If it
 // finds one, will return any arguments that have been appended to the
 // shortcut's command line. This is intended for scenarios where those shortcut
 // parameters are ordinarily ignored (i.e. metro apps on win8). Returns an
 // empty string on failure.
-string16 ReadArgumentsFromPinnedTaskbarShortcut();
+base::string16 ReadArgumentsFromPinnedTaskbarShortcut();
 
 }  // namespace winrt_utils
 
 #endif  // WIN8_METRO_DRIVER_WINRT_UTILS_H_