components: Cleanup class/struct fwd declarations

components/domain_reliability/monitor.h

 // Copyright 2014 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 COMPONENTS_DOMAIN_RELIABILITY_MONITOR_H_
 #define COMPONENTS_DOMAIN_RELIABILITY_MONITOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 16 matching lines @@
 #include "components/domain_reliability/util.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/load_timing_info.h"
 #include "net/base/net_error_details.h"
 #include "net/base/network_change_notifier.h"
 #include "net/http/http_response_info.h"
 #include "net/socket/connection_attempts.h"
 #include "net/url_request/url_request_status.h"
 
 namespace base {
-class ThreadChecker;
 class Value;
 }  // namespace base
 
 namespace net {
 class URLRequest;
 class URLRequestContext;
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace domain_reliability {
@@ skipping 141 matching lines @@
   bool discard_uploads_set_;
 
   base::WeakPtrFactory<DomainReliabilityMonitor> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DomainReliabilityMonitor);
 };
 
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_MONITOR_H_