MSE: Replace crossfade splicing overlap trimming.

media/renderers/audio_renderer_impl.cc

Index: media/renderers/audio_renderer_impl.cc
diff --git a/media/renderers/audio_renderer_impl.cc b/media/renderers/audio_renderer_impl.cc
index 3d24cf6508bc8a10518b0d60f94b4658755d7579..fe6972369aecb056c2537791d99ec5314d48b942 100644
--- a/media/renderers/audio_renderer_impl.cc
+++ b/media/renderers/audio_renderer_impl.cc
@@ -786,11 +786,11 @@ int AudioRendererImpl::Render(AudioBus* audio_bus,
       return 0;
     }
 
-    // Delay playback by writing silence if we haven't reached the first
-    // timestamp yet; this can occur if the video starts before the audio.
     if (algorithm_->frames_buffered() > 0) {
-      CHECK_NE(first_packet_timestamp_, kNoTimestamp);
       CHECK_GE(first_packet_timestamp_, base::TimeDelta());
+
+      // Delay playback by writing silence if we haven't reached the first
+      // timestamp yet; this can occur if the video starts before the audio.
       const base::TimeDelta play_delay =
           first_packet_timestamp_ - audio_clock_->back_timestamp();
       if (play_delay > base::TimeDelta()) {