Convert media constants to constexpr.

media/base/decoder_buffer.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/base/decoder_buffer.h"
 
 namespace media {
 
 // Allocates a block of memory which is padded for use with the SIMD
 // optimizations used by FFmpeg.
@@ skipping 32 matching lines @@
   DCHECK_GT(side_data_size_, 0u);
   memcpy(side_data_.get(), side_data, side_data_size_);
 }
 
 DecoderBuffer::~DecoderBuffer() {}
 
 void DecoderBuffer::Initialize() {
   data_.reset(AllocateFFmpegSafeBlock(size_));
   if (side_data_size_ > 0)
     side_data_.reset(AllocateFFmpegSafeBlock(side_data_size_));
-  splice_timestamp_ = kNoTimestamp();
+  splice_timestamp_ = kNoTimestamp;
 }
 
 // static
 scoped_refptr<DecoderBuffer> DecoderBuffer::CopyFrom(const uint8_t* data,
                                                      size_t data_size) {
   // If you hit this CHECK you likely have a bug in a demuxer. Go fix it.
   CHECK(data);
   return make_scoped_refptr(new DecoderBuffer(data, data_size, NULL, 0));
 }
 
@@ skipping 46 matching lines @@
     side_data_size_ = side_data_size;
     side_data_.reset(AllocateFFmpegSafeBlock(side_data_size_));
     memcpy(side_data_.get(), side_data, side_data_size_);
   } else {
     side_data_.reset();
     side_data_size_ = 0;
   }
 }
 
 }  // namespace media