Revert of Add GetAssociatedOutputDeviceID support to pulse.

media/audio/pulse/pulse_util.h

Index: media/audio/pulse/pulse_util.h
diff --git a/media/audio/pulse/pulse_util.h b/media/audio/pulse/pulse_util.h
index 522f7f6c47d63fef3962b6fefad708bc7c83a012..b8e5cdcda4c606eaef98770e1507bbff99522855 100644
--- a/media/audio/pulse/pulse_util.h
+++ b/media/audio/pulse/pulse_util.h
@@ -16,8 +16,6 @@
 class AudioParameters;
 
 namespace pulse {
-
-enum class RequestType : int8_t { INPUT, OUTPUT };
 
 // A helper class that acquires pa_threaded_mainloop_lock() while in scope.
 class AutoPulseLock {
@@ -77,16 +75,6 @@
                         pa_stream_request_cb_t write_callback,
                         void* user_data);
 
-// Utility functions to match up outputs and inputs.
-std::string GetBusOfInput(pa_threaded_mainloop* mainloop,
-                          pa_context* context,
-                          const std::string& name);
-std::string GetOutputCorrespondingTo(pa_threaded_mainloop* mainloop,
-                                     pa_context* context,
-                                     const std::string& bus);
-std::string GetRealDefaultDeviceId(pa_threaded_mainloop* mainloop,
-                                   pa_context* context,
-                                   RequestType type);
 }  // namespace pulse
 
 }  // namespace media