Bug 1574187 - Stabilize profilerOverhead data in profile json. r=gerald

Depends on D42285

Differential Revision: https://phabricator.services.mozilla.com/D42286

--HG--
extra : moz-landing-system : lando

mozglue/baseprofiler/core/ProfileBufferEntry.cpp

@@ -804,7 +804,7 @@ void ProfileBuffer::StreamProfilerOverheadToJSON(
 
   EntryGetter e(*this);
 
-  aWriter.StartObjectProperty("profilerOverhead_UNSTABLE");
+  aWriter.StartObjectProperty("profilerOverhead");
   aWriter.StartObjectProperty("samples");
   // Stream all sampling overhead data. We skip other entries, because we
   // process them in StreamSamplesToJSON()/etc.

tools/profiler/core/ProfileBufferEntry.cpp

@@ -1197,7 +1197,7 @@ void ProfileBuffer::StreamProfilerOverheadToJSON(
 
   EntryGetter e(*this);
 
-  aWriter.StartObjectProperty("profilerOverhead_UNSTABLE");
+  aWriter.StartObjectProperty("profilerOverhead");
   aWriter.StartObjectProperty("samples");
   // Stream all sampling overhead data. We skip other entries, because we
   // process them in StreamSamplesToJSON()/etc.