Revert of Add a NavigationThrottle to the public content/ interface

content/browser/loader/navigation_resource_throttle.h

-// Copyright 2015 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_BROWSER_LOADER_NAVIGATION_RESOURCE_THROTTLE_H_
-#define CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_THROTTLE_H_
-
-#include "base/basictypes.h"
-#include "base/memory/weak_ptr.h"
-#include "content/public/browser/navigation_throttle.h"
-#include "content/public/browser/resource_throttle.h"
-
-namespace net {
-class URLRequest;
-}
-
-namespace content {
-
-// This ResourceThrottle is used to convey throttling information to the UI
-// thread during navigations. The UI thread can then use its NavigationThrottle
-// mechanism to interact with the navigation.
-class NavigationResourceThrottle : public ResourceThrottle {
- public:
-  NavigationResourceThrottle(net::URLRequest* request);
-  ~NavigationResourceThrottle() override;
-
-  // ResourceThrottle overrides:
-  void WillStartRequest(bool* defer) override;
-  void WillRedirectRequest(const net::RedirectInfo& redirect_info,
-                           bool* defer) override;
-  const char* GetNameForLogging() const override;
-
- private:
-  void OnUIChecksPerformed(NavigationThrottle::ThrottleCheckResult result);
-
-  net::URLRequest* request_;
-  base::WeakPtrFactory<NavigationResourceThrottle> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(NavigationResourceThrottle);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_THROTTLE_H_