Use a direct include of strings headers in content/p*/.

content/public/renderer/content_renderer_client.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 CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <string>
 
-#include "base/string16.h"
 #include "base/memory/weak_ptr.h"
-#include "ipc/ipc_message.h"
+#include "base/strings/string16.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/page_transition_types.h"
+#include "ipc/ipc_message.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationPolicy.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationType.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
 #include "v8/include/v8.h"
 
 class GURL;
 class SkBitmap;
 
 namespace base {
 class FilePath;
@@ skipping 213 matching lines @@
       webkit::ppapi::PpapiInterfaceFactoryManager* factory_manager) {}
 
   // Returns whether BrowserPlugin should be allowed within the |container|.
   virtual bool AllowBrowserPlugin(WebKit::WebPluginContainer* container) const;
 
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_