Clean up PlatformThread.

webrtc/system_wrappers/include/data_log_impl.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 128 matching lines @@
 
   // Collection of tables indexed by the table name as std::string.
   typedef std::map<std::string, LogTable*> TableMap;
   typedef rtc::scoped_ptr<CriticalSectionWrapper> CritSectScopedPtr;
 
   static CritSectScopedPtr  crit_sect_;
   static DataLogImpl*       instance_;
   int                       counter_;
   TableMap                  tables_;
   EventWrapper*             flush_event_;
-  rtc::scoped_ptr<PlatformThread> file_writer_thread_;
+  // This is a scoped_ptr so that we don't have to create threads in the no-op
+  // impl.
+  rtc::scoped_ptr<rtc::PlatformThread> file_writer_thread_;
   RWLockWrapper*            tables_lock_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_DATA_LOG_IMPL_H_