Use a direct include of strings headers in chrome_frame/.

chrome_frame/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 CHROME_FRAME_UTILS_H_
 #define CHROME_FRAME_UTILS_H_
 
 #include <OAidl.h>
 #include <objidl.h>
 #include <windows.h>
 #include <wininet.h>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/win/scoped_comptr.h"
 #include "googleurl/src/gurl.h"
 #include "ui/gfx/rect.h"
 
 class RegistryListPreferencesHolder;
 interface IBrowserService;
 interface IWebBrowser2;
 struct ContextMenuModel;
 
 namespace base {
@@ skipping 567 matching lines @@
 // increase the connection count once per process.
 // Returns true on success.
 bool IncreaseWinInetConnections(DWORD connections);
 
 // Sets |profile_path| to the path for the Chrome Frame |profile_name|
 // profile.
 void GetChromeFrameProfilePath(const string16& profile_name,
                                base::FilePath* profile_path);
 
 #endif  // CHROME_FRAME_UTILS_H_