[Sync] Fix namespaces for the sync_sessions component.

components/sync_sessions/synced_session.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 "components/sync_sessions/synced_session.h"
 
 #include "base/stl_util.h"
 
-namespace sync_driver {
+namespace sync_sessions {
 
 SyncedSession::SyncedSession()
     : session_tag("invalid"), device_type(TYPE_UNSET) {}
 
 SyncedSession::~SyncedSession() {
   base::STLDeleteContainerPairSecondPointers(windows.begin(), windows.end());
 }
 
 sync_pb::SessionHeader SyncedSession::ToSessionHeader() const {
   sync_pb::SessionHeader header;
@@ skipping 24 matching lines @@
       break;
     case SyncedSession::TYPE_OTHER:
     // Intentionally fall-through
     default:
       header.set_device_type(sync_pb::SyncEnums_DeviceType_TYPE_OTHER);
       break;
   }
   return header;
 }
 
-}  // namespace sync_driver
+}  // namespace sync_sessions