Bug 1087435 - Fix accidental return. r=me

tools/profiler/ThreadResponsiveness.cpp

@@ -98,7 +98,6 @@ ThreadResponsiveness::~ThreadResponsiveness()
 void
 ThreadResponsiveness::Update()
 {
-  return;
   if (!mActiveTracerEvent) {
     if (mThreadProfile->GetThreadInfo()->IsMainThread()) {
       mActiveTracerEvent = new CheckResponsivenessTask();