content: Cleanup class/struct forward declarations

content/browser/loader/test_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_TEST_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_TEST_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/loader/resource_handler.h"
 #include "net/base/io_buffer.h"
 
 class GURL;
 
 namespace net {
-class URLRequest;
 class URLRequestStatus;
 }
 
 namespace content {
 
 class ResourceHandler;
 struct ResourceResponse;
 
 // A test version of a ResourceHandler. It returns a configurable buffer in
 // response to OnWillStart. It records what ResourceHandler methods are called,
@@ skipping 94 matching lines @@
   int on_will_read_called_ = 0;
   int on_read_completed_called_ = 0;
   int on_response_completed_called_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TestResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_TEST_RESOURCE_HANDLER_H_