Clean up sparse_histogram.h header

google_apis/gcm/engine/connection_factory_impl.cc

 // Copyright (c) 2013 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.
 
 #include "google_apis/gcm/engine/connection_factory_impl.h"
 
 #include <string>
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
-#include "base/metrics/sparse_histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "google_apis/gcm/engine/connection_handler_impl.h"
 #include "google_apis/gcm/monitoring/gcm_stats_recorder.h"
 #include "google_apis/gcm/protocol/mcs.pb.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_request_headers.h"
 #include "net/log/net_log_source_type.h"
 #include "net/proxy/proxy_info.h"
@@ skipping 550 matching lines @@
 
 void ConnectionFactoryImpl::RebuildNetworkSessionAuthCache() {
   if (!http_network_session_ || !http_network_session_->http_auth_cache())
     return;
 
   gcm_network_session_->http_auth_cache()->UpdateAllFrom(
       *http_network_session_->http_auth_cache());
 }
 
 }  // namespace gcm