Convert media constants to constexpr.

media/filters/audio_renderer_algorithm_unittest.cc

Index: media/filters/audio_renderer_algorithm_unittest.cc
diff --git a/media/filters/audio_renderer_algorithm_unittest.cc b/media/filters/audio_renderer_algorithm_unittest.cc
index 18f755c577d24b1a8bb8a7efdc83746dee0ce59c..53483f6d4e0832e503bec3405fdf29628add96ed 100644
--- a/media/filters/audio_renderer_algorithm_unittest.cc
+++ b/media/filters/audio_renderer_algorithm_unittest.cc
@@ -112,19 +112,19 @@ class AudioRendererAlgorithmTest : public testing::Test {
           buffer = MakeAudioBuffer<uint8_t>(
               sample_format_, channel_layout_,
               ChannelLayoutToChannelCount(channel_layout_), samples_per_second_,
-              1, 1, kFrameSize, kNoTimestamp());
+              1, 1, kFrameSize, kNoTimestamp);
           break;
         case kSampleFormatS16:
           buffer = MakeAudioBuffer<int16_t>(
               sample_format_, channel_layout_,
               ChannelLayoutToChannelCount(channel_layout_), samples_per_second_,
-              1, 1, kFrameSize, kNoTimestamp());
+              1, 1, kFrameSize, kNoTimestamp);
           break;
         case kSampleFormatS32:
           buffer = MakeAudioBuffer<int32_t>(
               sample_format_, channel_layout_,
               ChannelLayoutToChannelCount(channel_layout_), samples_per_second_,
-              1, 1, kFrameSize, kNoTimestamp());
+              1, 1, kFrameSize, kNoTimestamp);
           break;
         default:
           NOTREACHED() << "Unrecognized format " << sample_format_;