Bug 1626918 - Don't start/stop the real-time tracing code from the objects they measure. r=achronop

The profile now handles this.

Differential Revision: https://phabricator.services.mozilla.com/D78506

dom/media/AudioStream.cpp

@@ -270,8 +270,6 @@ int AudioStream::InvokeCubeb(Function aFunction, Args&&... aArgs) {
 nsresult AudioStream::Init(uint32_t aNumChannels,
                            AudioConfig::ChannelLayout::ChannelMap aChannelMap,
                            uint32_t aRate, AudioDeviceInfo* aSinkInfo) {
-  StartAudioCallbackTracing();
-
   auto startTime = TimeStamp::Now();
   TRACE();
 
@@ -436,8 +434,6 @@ void AudioStream::Shutdown() {
     // Must not try to shut down cubeb from within the lock!  wasapi may still
     // call our callback after Pause()/stop()!?! Bug 996162
     mCubebStream.reset();
-
-    StopAudioCallbackTracing();
   }
 
   mState = SHUTDOWN;

dom/media/MediaTrackGraph.cpp

@@ -67,7 +67,6 @@ MediaTrackGraphImpl::~MediaTrackGraphImpl() {
              "thread");
   LOG(LogLevel::Debug, ("MediaTrackGraph %p destroyed", this));
   LOG(LogLevel::Debug, ("MediaTrackGraphImpl::~MediaTrackGraphImpl"));
-  StopAudioCallbackTracing();
 }
 
 void MediaTrackGraphImpl::AddTrackGraphThread(MediaTrack* aTrack) {
@@ -3031,8 +3030,6 @@ MediaTrackGraphImpl::MediaTrackGraphImpl(
 
   mLastMainThreadUpdate = TimeStamp::Now();
 
-  StartAudioCallbackTracing();
-
   RegisterWeakAsyncMemoryReporter(this);
 
   if (!IsNonRealtime()) {