Convert media constants to constexpr.

media/base/seekable_buffer.h

 // 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.
 
 // SeekableBuffer to support backward and forward seeking in a buffer for
 // reading a media data source.
 //
 // In order to support backward and forward seeking, this class buffers data in
 // both backward and forward directions, the current read position can be reset
 // to anywhere in the buffered data.
@@ skipping 110 matching lines @@
 
   // Returns the maximum number of bytes that should be kept in the backward
   // direction.
   int backward_capacity() const { return backward_capacity_; }
 
   // Returns the current timestamp, taking into account current offset. The
   // value calculated based on the timestamp of the current buffer. If
   // timestamp for the current buffer is set to 0 or the data was added with
   // Append(const uint*, int), then returns value that corresponds to the
   // last position in a buffer that had timestamp set.
-  // kNoTimestamp() is returned if no buffers we read from had timestamp set.
+  // kNoTimestamp is returned if no buffers we read from had timestamp set.
   base::TimeDelta current_time() const { return current_time_; }
 
  private:
   // Definition of the buffer queue.
   typedef std::list<scoped_refptr<DataBuffer> > BufferQueue;
 
   // A helper method to evict buffers in the backward direction until backward
   // bytes is within the backward capacity.
   void EvictBackwardBuffers();
 
@@ skipping 38 matching lines @@
   // Keeps track of the most recent time we've seen in case the |buffers_| is
   // empty when our owner asks what time it is.
   base::TimeDelta current_time_;
 
   DISALLOW_COPY_AND_ASSIGN(SeekableBuffer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_SEEKABLE_BUFFER_H_