content: Cleanup class/struct forward declarations

content/browser/loader/mojo_async_resource_handler.h

 // Copyright 2016 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_MOJO_ASYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/system/watcher.h"
 #include "net/base/io_buffer.h"
 #include "url/gurl.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 class ResourceDispatcherHostImpl;
-class ResourceRequestInfoImpl;
 struct ResourceResponse;
 
 // Used to complete an asynchronous resource request in response to resource
 // load events from the resource dispatcher host. This class is used only
 // when LoadingWithMojo runtime flag is enabled.
 //
 // TODO(yhirano): Implement redirects.
 // TODO(yhirano): Implement downloading to file.
 // TODO(yhirano): Add histograms.
 // TODO(yhirano): Set zoom level.
@@ skipping 72 matching lines @@
   size_t buffer_offset_ = 0;
   size_t buffer_bytes_read_ = 0;
   scoped_refptr<SharedWriter> shared_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoAsyncResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_MOJO_ASYNC_RESOURCE_HANDLER_H_