Remove fields from Isolate in Product mode

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index be4bd31e197364af831d05df3b095d19ff40f326..1d925b382ea3dfd0ca528985b94c56c47b00aabb 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -979,6 +979,7 @@ void Service::SendEventWithData(const char* stream_id,
   SendEvent(stream_id, event_type, message, total_bytes);
 }
 
+#if !defined(PRODUCT)
 static void ReportPauseOnConsole(ServiceEvent* event) {
   const char* name = event->isolate()->debugger_name();
   switch (event->kind()) {
@@ -1034,14 +1035,17 @@ static void ReportPauseOnConsole(ServiceEvent* event) {
     OS::PrintErr("%s\n", err.ToErrorCString());
   }
 }
+#endif
 
 void Service::HandleEvent(ServiceEvent* event) {
   if (event->stream_info() != NULL && !event->stream_info()->enabled()) {
+#if !defined(PRODUCT)
     if (FLAG_warn_on_pause_with_no_debugger && event->IsPause()) {
       // If we are about to pause a running program which has no
       // debugger connected, tell the user about it.
       ReportPauseOnConsole(event);
     }
+#endif
     // Ignore events when no one is listening to the event stream.
     return;
   }