tracing: remove sampling state profiler

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

Index: third_party/WebKit/Source/platform/heap/Heap.cpp
diff --git a/third_party/WebKit/Source/platform/heap/Heap.cpp b/third_party/WebKit/Source/platform/heap/Heap.cpp
index 2349898755620e2b43610cf4b2dd5c2538cff36b..5388141f90f104d79b1bfcb46fe3ebd1fdc0b688 100644
--- a/third_party/WebKit/Source/platform/heap/Heap.cpp
+++ b/third_party/WebKit/Source/platform/heap/Heap.cpp
@@ -67,9 +67,6 @@ 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
@@ -85,8 +82,6 @@ class ParkThreadsScope final {
                                  50));
     timeToStopThreadsHistogram.count(timeForStoppingThreads);
 
-    if (m_state->isMainThread())
-      TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(samplingState);
     return m_shouldResumeThreads;
   }