Convert media constants to constexpr.

media/formats/mp2t/es_adapter_video_unittest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include <sstream>
 #include <string>
 #include <vector>
@@ skipping 29 matching lines @@
                     const bool* is_key_frame,
                     size_t frame_count) {
   uint8_t dummy_buffer[] = {0, 0, 0, 0};
 
   StreamParserBuffer::BufferQueue buffers(frame_count);
   for (size_t k = 0; k < frame_count; k++) {
     buffers[k] = StreamParserBuffer::CopyFrom(
         dummy_buffer, arraysize(dummy_buffer),
         is_key_frame[k], DemuxerStream::VIDEO, 0);
     if (frame_pts_ms[k] < 0) {
-      buffers[k]->set_timestamp(kNoTimestamp());
+      buffers[k]->set_timestamp(kNoTimestamp);
     } else {
       buffers[k]->set_timestamp(
           base::TimeDelta::FromMilliseconds(frame_pts_ms[k]));
     }
   }
   return buffers;
 }
 
 }
 
@@ skipping 102 matching lines @@
   bool is_key_frame[] = {false, false, false, true, false, false};
   StreamParserBuffer::BufferQueue buffer_queue =
       GenerateFakeBuffers(pts_ms, is_key_frame, arraysize(pts_ms));
 
   EXPECT_EQ("(70,Y) (30,Y) (30,N) (30,N)",
             RunAdapterTest(buffer_queue));
 }
 
 }  // namespace mp2t
 }  // namespace media