Convert media constants to constexpr.

media/filters/decrypting_audio_decoder.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/filters/decrypting_audio_decoder.h"
 
 #include <stdint.h>
 
 #include <cstdlib>
 
@@ skipping 96 matching lines @@
 
   // Return empty (end-of-stream) frames if decoding has finished.
   if (state_ == kDecodeFinished) {
     output_cb_.Run(AudioBuffer::CreateEOSBuffer());
     base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::OK);
     return;
   }
 
   // Initialize the |next_output_timestamp_| to be the timestamp of the first
   // non-EOS buffer.
-  if (timestamp_helper_->base_timestamp() == kNoTimestamp() &&
+  if (timestamp_helper_->base_timestamp() == kNoTimestamp &&
       !buffer->end_of_stream()) {
     timestamp_helper_->SetBaseTimestamp(buffer->timestamp());
   }
 
   pending_buffer_to_decode_ = buffer;
   state_ = kPendingDecode;
   DecodePendingBuffer();
 }
 
 void DecryptingAudioDecoder::Reset(const base::Closure& closure) {
@@ skipping 188 matching lines @@
 
   if (state_ == kWaitingForKey) {
     state_ = kPendingDecode;
     DecodePendingBuffer();
   }
 }
 
 void DecryptingAudioDecoder::DoReset() {
   DCHECK(init_cb_.is_null());
   DCHECK(decode_cb_.is_null());
-  timestamp_helper_->SetBaseTimestamp(kNoTimestamp());
+  timestamp_helper_->SetBaseTimestamp(kNoTimestamp);
   state_ = kIdle;
   base::ResetAndReturn(&reset_cb_).Run();
 }
 
 void DecryptingAudioDecoder::ProcessDecodedFrames(
     const Decryptor::AudioFrames& frames) {
   for (Decryptor::AudioFrames::const_iterator iter = frames.begin();
        iter != frames.end();
        ++iter) {
     scoped_refptr<AudioBuffer> frame = *iter;
@@ skipping 10 matching lines @@
     }
 
     frame->set_timestamp(current_time);
     timestamp_helper_->AddFrames(frame->frame_count());
 
     output_cb_.Run(frame);
   }
 }
 
 }  // namespace media