Convert media constants to constexpr.

media/base/android/media_decoder_job.h

Index: media/base/android/media_decoder_job.h
diff --git a/media/base/android/media_decoder_job.h b/media/base/android/media_decoder_job.h
index 4facf4873f32794e47dddfdcb1a7719de00e4a30..3313e5e053c393c7427a66652bec5acbaad34eb8 100644
--- a/media/base/android/media_decoder_job.h
+++ b/media/base/android/media_decoder_job.h
@@ -45,7 +45,7 @@ class MediaDecoderJob {
   // Callback when a decoder job finishes its work. Args: whether decode
   // finished successfully, a flag whether the frame is late for statistics,
   // cacurrent presentation time, max presentation time.
-  // If the current presentation time is equal to kNoTimestamp(), the decoder
+  // If the current presentation time is equal to kNoTimestamp, the decoder
   // job skipped rendering of the decoded output and the callback target should
   // ignore the timestamps provided. The late frame flag has no meaning in this
   // case.