address comments

Author: nolanmar511

bindings/profiler.cc

@@ -275,14 +275,10 @@ NAN_METHOD(StartProfiling) {
   // profile is collected, there cannot be multiple CPU profiling requests
   // inflight in parallel.
   if (cpuProfiler) {
-    return Nan::ThrowError("CPU profiler is already started.");
+    return Nan::ThrowError("CPU profiler is already started or has already been stopped and destroyed.");
   }
   cpuProfiler = CpuProfiler::New(v8::Isolate::GetCurrent());
-  // The default sampling interval is 1000us. If the sampling interval is
-  // different, set the sampling interval.
-  if (samplingIntervalUS != 1000) {
-    cpuProfiler->SetSamplingInterval(samplingIntervalUS);
-  }
+  cpuProfiler->SetSamplingInterval(samplingIntervalUS);
 #endif
 
   Local<String> name =