Clean-up: Remove the very last few uses of base::Time from src/media/

media/audio/audio_output_controller.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 "media/audio/audio_output_controller.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/metrics/histogram.h"
 #include "base/task_runner_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "media/base/scoped_histogram_timer.h"
 
-using base::Time;
 using base::TimeDelta;
 
 namespace media {
 
 #if defined(AUDIO_POWER_MONITORING)
 // Time constant for AudioPowerMonitor.  See AudioPowerMonitor ctor comments for
 // semantics.  This value was arbitrarily chosen, but seems to work well.
 static const int kPowerMeasurementTimeConstantMillis = 10;
 
 // Desired frequency of calls to EventHandler::OnPowerMeasured() for reporting
@@ skipping 456 matching lines @@
     UMA_HISTOGRAM_BOOLEAN(
         "Media.AudioOutputControllerPlaybackStartupSuccess", playback_success);
 
     // Let the AudioManager try and fix it.
     if (!playback_success)
       audio_manager_->FixWedgedAudio();
   }
 }
 
 }  // namespace media