Move Time, TimeDelta and TimeTicks into namespace base.

base/trace_event.h

 // Copyright (c) 2006-2008 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.
 
 // Trace events to track application performance.  Events consist of a name
 // a type (BEGIN, END or INSTANT), a tracking id and extra string data.
 // In addition, the current process id, thread id, a timestamp down to the
 // microsecond and a file and line number of the calling location.
 //
 // The current implementation logs these events into a log file of the form
@@ skipping 107 matching lines @@
   bool OpenLogFile();
   void CloseLogFile();
   bool Start();
   void Stop();
   void Heartbeat();
   void Log(const std::string& msg);
 
   bool enabled_;
   FILE* log_file_;
   Lock file_lock_;
-  TimeTicks trace_start_time_;
+  base::TimeTicks trace_start_time_;
   scoped_ptr<process_util::ProcessMetrics> process_metrics_;
   RepeatingTimer<TraceLog> timer_;
 };
 
 } // namespace base
 
 #endif // BASE_TRACE_EVENT_H_