tracing: remove sampling state profiler

third_party/WebKit/Source/platform/heap/ThreadState.cpp

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index da6d06ab4a741c0ad91d2270321656812f5f762d..ce2ba90164c3810e91c762226146f62924a43ce1 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -108,9 +108,6 @@ class ParkThreadsScope final {
 
   bool parkThreads() {
     TRACE_EVENT0("blink_gc", "ThreadHeap::ParkThreadsScope");
-    const char* samplingState = TRACE_EVENT_GET_SAMPLING_STATE();
-    if (m_state->isMainThread())
-      TRACE_EVENT_SET_SAMPLING_STATE("blink_gc", "BlinkGCWaiting");
 
     // TODO(haraken): In an unlikely coincidence that two threads decide
     // to collect garbage at the same time, avoid doing two GCs in
@@ -126,8 +123,6 @@ class ParkThreadsScope final {
                                  50));
     timeToStopThreadsHistogram.count(timeForStoppingThreads);
 
-    if (m_state->isMainThread())
-      TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(samplingState);
     return m_shouldResumeThreads;
   }
 
@@ -1682,7 +1677,6 @@ void ThreadState::collectGarbage(BlinkGC::StackState stackState,
   TRACE_EVENT2("blink_gc,devtools.timeline", "BlinkGCMarking", "lazySweeping",
                gcType == BlinkGC::GCWithoutSweep, "gcReason",
                gcReasonString(reason));
-  TRACE_EVENT_SCOPED_SAMPLING_STATE("blink_gc", "BlinkGC");
   double startTime = WTF::currentTimeMS();
 
   if (gcType == BlinkGC::TakeSnapshot)