Switch browser side audio capture path to use base time primitives.

media/audio/mac/audio_low_latency_input_mac.h

Index: media/audio/mac/audio_low_latency_input_mac.h
diff --git a/media/audio/mac/audio_low_latency_input_mac.h b/media/audio/mac/audio_low_latency_input_mac.h
index 623fe8973b01f818216cb225c3a14a73dfbdac83..8f9e3993c14a06580c5903a6390384ec9aff5d45 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -140,10 +140,10 @@ class MEDIA_EXPORT AUAudioInputStream
 
   // Gets the fixed capture hardware latency and store it during initialization.
   // Returns 0 if not available.
-  double GetHardwareLatency();
+  base::TimeDelta GetHardwareLatency();
 
   // Gets the current capture delay value.
-  double GetCaptureLatency(const AudioTimeStamp* input_time_stamp);
+  base::TimeDelta GetCaptureLatency(const AudioTimeStamp* input_time_stamp);
 
   // Gets the number of channels for a stream of audio data.
   int GetNumberOfChannelsFromStream();
@@ -232,8 +232,8 @@ class MEDIA_EXPORT AUAudioInputStream
   // array as soon as a frame of the desired buffer size has been recorded.
   std::unique_ptr<uint8_t[]> audio_data_buffer_;
 
-  // Fixed capture hardware latency in frames.
-  double hardware_latency_frames_;
+  // Fixed capture hardware latency.
+  base::TimeDelta hardware_latency_;
 
   // The number of channels in each frame of audio data, which is used
   // when querying the volume of each channel.