Extracting NetLog inner classes into their own classes.

net/url_request/url_request_context.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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's necessary when processing resource requests.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties.h"
 #include "net/http/transport_security_state.h"
-#include "net/log/net_log.h"
 #include "net/ssl/ssl_config_service.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
 class CertVerifier;
 class ChannelIDService;
 class CookieStore;
 class CTPolicyEnforcer;
 class CTVerifier;
 class HostResolver;
 class HttpAuthHandlerFactory;
 class HttpTransactionFactory;
 class HttpUserAgentSettings;
+class NetLog;
 class NetworkDelegate;
 class NetworkQualityEstimator;
 class SdchManager;
 class ProxyService;
 class URLRequest;
 class URLRequestBackoffManager;
 class URLRequestJobFactory;
 class URLRequestThrottlerManager;
 
 // Subclass to provide application-specific context for URLRequest
@@ skipping 233 matching lines @@
   // following redirects. TODO(estark): remove this flag once
   // Referrer-Policy ships (https://crbug.com/619228).
   bool enable_referrer_policy_header_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_