chrome: Cleanup class/struct forward declarations

chrome/renderer/net/net_error_helper.h

 // Copyright (c) 2013 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_RENDERER_NET_NET_ERROR_HELPER_H_
 #define CHROME_RENDERER_NET_NET_ERROR_HELPER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "chrome/common/network_diagnostics.mojom.h"
 #include "chrome/renderer/net/net_error_page_controller.h"
 #include "components/error_page/common/net_error_info.h"
 #include "components/error_page/renderer/net_error_helper_core.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/public/renderer/render_frame_observer_tracker.h"
 #include "content/public/renderer/render_thread_observer.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 
 class GURL;
 
 namespace blink {
-class WebFrame;
 class WebURLResponse;
 struct WebURLError;
 }
 
 namespace content {
 class ResourceFetcher;
 }
 
 namespace error_page {
 struct ErrorPageParams;
@@ skipping 108 matching lines @@
   // Weak factory for vending a weak pointer to a NetErrorPageController. Weak
   // pointers are invalidated on each commit, to prevent getting messages from
   // Controllers used for the previous commit that haven't yet been cleaned up.
   base::WeakPtrFactory<NetErrorPageController::Delegate>
       weak_controller_delegate_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetErrorHelper);
 };
 
 #endif  // CHROME_RENDERER_NET_NET_ERROR_HELPER_H_