A64: Synchronize with r18147.

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index 0f01818ecd99812c11f231b01d098a28746d6e39..004a33946148cc2a4f9c71591c5463606726d348 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -142,17 +142,15 @@ void V8::RemoveCallCompletedCallback(CallCompletedCallback callback) {
 
 void V8::FireCallCompletedCallback(Isolate* isolate) {
   bool has_call_completed_callbacks = call_completed_callbacks_ != NULL;
-  bool observer_delivery_pending =
-      FLAG_harmony_observation && isolate->observer_delivery_pending();
-  if (!has_call_completed_callbacks && !observer_delivery_pending) return;
+  bool microtask_pending = isolate->microtask_pending();
+  if (!has_call_completed_callbacks && !microtask_pending) return;
+
   HandleScopeImplementer* handle_scope_implementer =
       isolate->handle_scope_implementer();
   if (!handle_scope_implementer->CallDepthIsZero()) return;
   // Fire callbacks.  Increase call depth to prevent recursive callbacks.
   handle_scope_implementer->IncrementCallDepth();
-  if (observer_delivery_pending) {
-    JSObject::DeliverChangeRecords(isolate);
-  }
+  if (microtask_pending) Execution::RunMicrotasks(isolate);
   if (has_call_completed_callbacks) {
     for (int i = 0; i < call_completed_callbacks_->length(); i++) {
       call_completed_callbacks_->at(i)();