AudioConverter: Express delay in frames rather than msec.

media/base/audio_converter_perftest.cc

Index: media/base/audio_converter_perftest.cc
diff --git a/media/base/audio_converter_perftest.cc b/media/base/audio_converter_perftest.cc
index 092688e11be4b36025a474b89a1d52e45fcf1d6a..1862beeebd1739f4229fcdba7ce1f355adc554fb 100644
--- a/media/base/audio_converter_perftest.cc
+++ b/media/base/audio_converter_perftest.cc
@@ -20,8 +20,7 @@ class NullInputProvider : public AudioConverter::InputCallback {
   NullInputProvider() {}
   ~NullInputProvider() override {}
 
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override {
+  double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override {
     audio_bus->Zero();
     return 1;
   }