Convert media constants to constexpr.

media/base/decoder_buffer_queue_unittest.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"
 #include "media/base/decoder_buffer_queue.h"
 #include "media/base/timestamp_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 static base::TimeDelta ToTimeDelta(int seconds) {
   if (seconds < 0)
-    return kNoTimestamp();
+    return kNoTimestamp;
   return base::TimeDelta::FromSeconds(seconds);
 }
 
 // Helper to create buffers with specified timestamp in seconds.
 //
-// Negative numbers will be converted to kNoTimestamp();
+// Negative numbers will be converted to kNoTimestamp;
 static scoped_refptr<DecoderBuffer> CreateBuffer(int timestamp) {
   scoped_refptr<DecoderBuffer> buffer = new DecoderBuffer(0);
   buffer->set_timestamp(ToTimeDelta(timestamp));
   buffer->set_duration(ToTimeDelta(0));
   return buffer;
 }
 
 static scoped_refptr<DecoderBuffer> CreateBuffer(int timestamp, int size) {
   scoped_refptr<DecoderBuffer> buffer = new DecoderBuffer(size);
   buffer->set_timestamp(ToTimeDelta(timestamp));
@@ skipping 129 matching lines @@
   EXPECT_EQ(queue.data_size(), 2998u);
 
   queue.Clear();
   EXPECT_EQ(queue.data_size(), 0u);
 
   queue.Push(CreateBuffer(4, 1400u));
   EXPECT_EQ(queue.data_size(), 1400u);
 }
 
 }  // namespace media