Convert media constants to constexpr.

media/base/android/audio_decoder_job.cc

 // Copyright 2013 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/base/android/audio_decoder_job.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/threading/thread.h"
 #include "media/base/android/sdk_media_codec_bridge.h"
@@ skipping 90 matching lines @@
     size_t size,
     bool render_output,
     bool /* is_late_frame */,
     base::TimeDelta current_presentation_timestamp,
     MediaCodecStatus status,
     const DecoderCallback& callback) {
   render_output = render_output && (size != 0u);
   bool is_audio_underrun = false;
 
   // Ignore input value.
-  current_presentation_timestamp = kNoTimestamp();
+  current_presentation_timestamp = kNoTimestamp;
 
   if (render_output) {
     int64_t head_position;
     MediaCodecStatus play_status =
         (static_cast<AudioCodecBridge*>(media_codec_bridge_.get()))
             ->PlayOutputBuffer(output_buffer_index, size, offset, false,
                                &head_position);
     if (play_status == MEDIA_CODEC_OK) {
       base::TimeTicks current_time = base::TimeTicks::Now();
 
@@ skipping 118 matching lines @@
       !static_cast<AudioCodecBridge*>(media_codec_bridge_.get())
            ->CreateAudioTrack(output_sampling_rate_, output_num_channels_)) {
     DLOG(ERROR) << __FUNCTION__ << ": cannot create AudioTrack";
     return false;
   }
 
   return true;
 }
 
 }  // namespace media