Move TransferNavigationResourceThrottle to content since that's where it belongs. This is a step in…

chrome/browser/renderer_host/transfer_navigation_resource_throttle.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_BROWSER_RENDERER_HOST_TRANSFER_NAVIGATION_RESOURCE_THROTTLE_H_
-#define CHROME_BROWSER_RENDERER_HOST_TRANSFER_NAVIGATION_RESOURCE_THROTTLE_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "content/public/browser/resource_throttle.h"
-
-namespace net {
-class URLRequest;
-}
-
-// This ResourceThrottle checks whether a navigation redirect will cause a
-// renderer process swap. When that happens, we remember the request so
-// that we can transfer it to be handled by the new renderer. This fixes
-// http://crbug.com/79520
-class TransferNavigationResourceThrottle : public content::ResourceThrottle {
- public:
-  explicit TransferNavigationResourceThrottle(net::URLRequest* request);
-
-  // content::ResourceThrottle implementation:
-  virtual void WillRedirectRequest(const GURL& new_url, bool* defer) OVERRIDE;
-
- private:
-  virtual ~TransferNavigationResourceThrottle();
-
-  net::URLRequest* request_;
-
-  DISALLOW_COPY_AND_ASSIGN(TransferNavigationResourceThrottle);
-};
-
-
-#endif  // CHROME_BROWSER_RENDERER_HOST_TRANSFER_NAVIGATION_RESOURCE_THROTTLE_H_