Use a direct include of strings headers in chrome/app/.

chrome/app/client_util.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.
 
 // This file defines utility functions that can report details about the
 // host operating environment.
 
 #ifndef CHROME_APP_CLIENT_UTIL_H_
 #define CHROME_APP_CLIENT_UTIL_H_
 
 #include <windows.h>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 namespace sandbox {
   struct SandboxInterfaceInfo;
 }
 
 // Gets the path of the current exe with a trailing backslash.
 string16 GetExecutablePath();
 
 // Implements the common aspects of loading chrome.dll for both chrome and
 // chromium scenarios, which are in charge of implementing two abstract
@@ skipping 39 matching lines @@
  private:
   // Chrome.dll handle.
   HMODULE dll_;
 };
 
 // Factory for the MainDllLoader. Caller owns the pointer and should call
 // delete to free it.
 MainDllLoader* MakeMainDllLoader();
 
 #endif  // CHROME_APP_CLIENT_UTIL_H_