Use a direct include of strings headers in base/.

base/file_version_info.h

 // Copyright (c) 2011 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 BASE_FILE_VERSION_INFO_H__
 #define BASE_FILE_VERSION_INFO_H__
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
 extern "C" IMAGE_DOS_HEADER __ImageBase;
 #endif  // OS_WIN
 
 #include <string>
 
 #include "base/base_export.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 namespace base {
 class FilePath;
 }
 
 // Provides an interface for accessing the version information for a file. This
 // is the information you access when you select a file in the Windows Explorer,
 // right-click select Properties, then click the Version tab, and on the Mac
 // when you select a file in the Finder and do a Get Info.
 //
@@ skipping 48 matching lines @@
   virtual string16 original_filename() = 0;
   virtual string16 file_description() = 0;
   virtual string16 file_version() = 0;
   virtual string16 legal_copyright() = 0;
   virtual string16 legal_trademarks() = 0;
   virtual string16 last_change() = 0;
   virtual bool is_official_build() = 0;
 };
 
 #endif  // BASE_FILE_VERSION_INFO_H__