Bug 1349607 - Remove mVsyncTimestamp from the VsyncMarkerPayload r=mstange

Removing this field since we already have start/end time for each marker payloads.
Also we are assigning the same timestamp to them. We don't need to unnecessarily
duplicate the information here.

Differential Revision: https://phabricator.services.mozilla.com/D8551

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

tools/profiler/core/ProfilerMarkerPayload.cpp

@@ -135,8 +135,6 @@ VsyncMarkerPayload::StreamPayload(SpliceableJSONWriter& aWriter,
                                   UniqueStacks& aUniqueStacks)
 {
   StreamType("VsyncTimestamp", aWriter);
-  aWriter.DoubleProperty("vsync",
-                         (mVsyncTimestamp - aProcessStartTime).ToMilliseconds());
 }
 
 static const char *GetNetworkState(NetworkLoadType aType)

tools/profiler/public/ProfilerMarkerPayload.h

@@ -200,13 +200,9 @@ class VsyncMarkerPayload : public ProfilerMarkerPayload
 public:
   explicit VsyncMarkerPayload(mozilla::TimeStamp aVsyncTimestamp)
     : ProfilerMarkerPayload(aVsyncTimestamp, aVsyncTimestamp)
-    , mVsyncTimestamp(aVsyncTimestamp)
   {}
 
   DECL_STREAM_PAYLOAD
-
-private:
-  mozilla::TimeStamp mVsyncTimestamp;
 };
 
 class NetworkMarkerPayload : public ProfilerMarkerPayload