content: Cleanup class/struct forward declarations

content/browser/loader/resource_scheduler.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 CONTENT_BROWSER_LOADER_RESOURCE_SCHEDULER_H_
 #define CONTENT_BROWSER_LOADER_RESOURCE_SCHEDULER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/common/content_export.h"
 #include "net/base/priority_queue.h"
 #include "net/base/request_priority.h"
 
 namespace net {
-class HostPortPair;
 class URLRequest;
 }
 
 namespace content {
 class ResourceThrottle;
 
 // There is one ResourceScheduler. All renderer-initiated HTTP requests are
 // expected to pass through it.
 //
 // There are two types of input to the scheduler:
@@ skipping 106 matching lines @@
   // True if requests to servers that support priorities (e.g., H2/QUIC) can
   // be delayed.
   bool priority_requests_delayable_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceScheduler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_SCHEDULER_H_