[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/sessions/sync_session_context.cc

 // 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.
 
 #include "sync/sessions/sync_session_context.h"
 
 #include "sync/engine/throttled_data_type_tracker.h"
 #include "sync/sessions/debug_info_getter.h"
 #include "sync/util/extensions_activity_monitor.h"
 
 namespace syncer {
 namespace sessions {
 
 const unsigned int kMaxMessagesToRecord = 10;
 const unsigned int kMaxMessageSizeToRecord = 5 * 1024;
 
 SyncSessionContext::SyncSessionContext(
     ServerConnectionManager* connection_manager,
     syncable::Directory* directory,
     const ModelSafeRoutingInfo& model_safe_routing_info,
     const std::vector<ModelSafeWorker*>& workers,
     ExtensionsActivityMonitor* extensions_activity_monitor,
     ThrottledDataTypeTracker* throttled_data_type_tracker,
     const std::vector<SyncEngineEventListener*>& listeners,
     DebugInfoGetter* debug_info_getter,
-    syncer::TrafficRecorder* traffic_recorder)
+    TrafficRecorder* traffic_recorder)
     : resolver_(NULL),
       connection_manager_(connection_manager),
       directory_(directory),
       routing_info_(model_safe_routing_info),
       workers_(workers),
       extensions_activity_monitor_(extensions_activity_monitor),
       notifications_enabled_(false),
       max_commit_batch_size_(kDefaultMaxCommitBatchSize),
       throttled_data_type_tracker_(throttled_data_type_tracker),
       debug_info_getter_(debug_info_getter),
       traffic_recorder_(traffic_recorder) {
   std::vector<SyncEngineEventListener*>::const_iterator it;
   for (it = listeners.begin(); it != listeners.end(); ++it)
     listeners_.AddObserver(*it);
 }
 
 SyncSessionContext::~SyncSessionContext() {
 }
 
 }  // namespace sessions
 }  // namespace syncer