Some wstring -> string16 conversion in src/app.

app/resource_bundle_win.cc

 // Copyright (c) 2010 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.
 
 #include "app/resource_bundle.h"
 
 #include <atlbase.h>
 
 #include "app/app_paths.h"
 #include "app/data_pack.h"
@@ skipping 141 matching lines @@
                                                                   message_id);
   if (!image) {
     // Fall back on the current module (shouldn't be any strings here except
     // in unittests).
     image = AtlGetStringResourceImage(_AtlBaseModule.GetModuleInstance(),
                                       message_id);
     if (!image) {
       // See http://crbug.com/21925.
       base::debug::StackTrace().PrintBacktrace();
       NOTREACHED() << "unable to find resource: " << message_id;
-      return std::wstring();
+      return string16();
     }
   }
   // Copy into a string16 and return.
   return string16(image->achString, image->nLength);
 }