Motown: Get rid of speculative clock definition

mojo/services/media/control/interfaces/media_source.mojom

Index: mojo/services/media/control/interfaces/media_source.mojom
diff --git a/mojo/services/media/control/interfaces/media_source.mojom b/mojo/services/media/control/interfaces/media_source.mojom
index 3ccb888faa38771737b005db82b4cab65523cb89..b1b89d0941e22845e0f802de45a9b4fc43b2246c 100644
--- a/mojo/services/media/control/interfaces/media_source.mojom
+++ b/mojo/services/media/control/interfaces/media_source.mojom
@@ -5,7 +5,6 @@
 [DartPackage="mojo_services"]
 module mojo.media;
 
-import "mojo/services/media/common/interfaces/media_clock.mojom";
 import "mojo/services/media/common/interfaces/media_common.mojom";
 import "mojo/services/media/common/interfaces/media_metadata.mojom";
 import "mojo/services/media/common/interfaces/media_state.mojom";
@@ -21,15 +20,6 @@ interface MediaSource {
   // Gets the streams produced by this source.
   GetStreams() => (array<MediaSourceStreamDescriptor> streams);
 
-  // Gets the clock disposition from the source.
-  GetClockDisposition() => (ClockDisposition clock_disposition);
-
-  // Gets a master clock if the source can be master, null otherwise.
-  GetMasterClock(Clock& master_clock);
-
-  // Sets a master clock.
-  SetMasterClock(Clock? master_clock);
-
   // Gets the producer for the specified stream.
   GetProducer(uint32 stream_index, MediaProducer& producer);