Compile fix for gcc 4.6 (unused variable).

content/renderer/media/audio_renderer_impl.cc

 // Copyright (c) 2011 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 "content/renderer/media/audio_renderer_impl.h"
 
 #include <math.h>
 
 #include <algorithm>
 
@@ skipping 185 matching lines @@
                                size_t number_of_frames,
                                size_t audio_delay_milliseconds) {
   if (stopped_ || GetPlaybackRate() == 0.0f) {
     // Output silence if stopped.
     for (size_t i = 0; i < audio_data.size(); ++i)
       memset(audio_data[i], 0, sizeof(float) * number_of_frames);
     return;
   }
 
   // Adjust the playback delay.
-  base::Time current_time = base::Time::Now();
-
   base::TimeDelta request_delay =
       base::TimeDelta::FromMilliseconds(audio_delay_milliseconds);
 
   // Finally we need to adjust the delay according to playback rate.
   if (GetPlaybackRate() != 1.0f) {
     request_delay = base::TimeDelta::FromMicroseconds(
         static_cast<int64>(ceil(request_delay.InMicroseconds() *
                                 GetPlaybackRate())));
   }
 
@@ skipping 22 matching lines @@
                                     bytes_per_frame / channels,
                                     filled_frames);
 
     // If FillBuffer() didn't give us enough data then zero out the remainder.
     if (filled_frames < number_of_frames) {
       int frames_to_zero = number_of_frames - filled_frames;
       memset(audio_data[channel_index], 0, sizeof(float) * frames_to_zero);
     }
   }
 }