Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/net/chrome_url_request_context.h

 // Copyright (c) 2011 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_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #define CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
 class ChromeURLDataManagerBackend;
 class ChromeURLRequestContextFactory;
 class IOThread;
 class Profile;
 class ProfileIOData;
 namespace base {
 class WaitableEvent;
 }
-namespace net {
-class NetworkDelegate;
-}
 
 // Subclass of net::URLRequestContext which can be used to store extra
 // information for requests.
 //
 // All methods of this class must be called from the IO thread,
 // including the constructor and destructor.
 class ChromeURLRequestContext : public net::URLRequestContext {
  public:
   ChromeURLRequestContext();
 
@@ skipping 154 matching lines @@
 
   // NULL if not yet initialized. Otherwise, it is the net::URLRequestContext
   // instance that was lazily created by GetURLRequestContext().
   // Access only from the IO thread.
   base::WeakPtr<net::URLRequestContext> url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeURLRequestContextGetter);
 };
 
 #endif  // CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_