Reduce the amount of included header files. Vast change like in "Oh God! This...

net/url_request/url_request_context.h

 // Copyright (c) 2006-2008 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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's useful when processing resource requests.
 // The class is reference-counted so that it can be cleaned up after any
 // requests that are using it have been completed.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 #include "net/base/cookie_policy.h"
 #include "net/ftp/ftp_auth_cache.h"
-#include "net/http/http_transaction_factory.h"
 
 namespace net {
+class HttpTransactionFactory;
 class CookieMonster;
 class ProxyService;
 }
 
 // Subclass to provide application-specific context for URLRequest instances.
 class URLRequestContext :
     public base::RefCountedThreadSafe<URLRequestContext> {
  public:
   URLRequestContext()
       : proxy_service_(NULL),
@@ skipping 46 matching lines @@
   net::CookiePolicy cookie_policy_;
   net::FtpAuthCache ftp_auth_cache_;
   std::string accept_language_;
   std::string accept_charset_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_