Remove old TODO and commented-out DCHECK in Isolate::RunMicrotasks

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 2635 matching lines @@
     queue = FixedArray::CopySize(queue, num_tasks * 2);
     heap()->set_microtask_queue(*queue);
   }
   DCHECK(queue->get(num_tasks)->IsUndefined());
   queue->set(num_tasks, *microtask);
   set_pending_microtask_count(num_tasks + 1);
 }
 
 
 void Isolate::RunMicrotasks() {
-  // %RunMicrotasks may be called in mjsunit tests, which violates
-  // this assertion, hence the check for --allow-natives-syntax.
-  // TODO(adamk): However, this also fails some layout tests.
-  //
-  // DCHECK(FLAG_allow_natives_syntax ||
-  //        handle_scope_implementer()->CallDepthIsZero());
-
   // Increase call depth to prevent recursive callbacks.
   v8::Isolate::SuppressMicrotaskExecutionScope suppress(
       reinterpret_cast<v8::Isolate*>(this));
 
   while (pending_microtask_count() > 0) {
     HandleScope scope(this);
     int num_tasks = pending_microtask_count();
     Handle<FixedArray> queue(heap()->microtask_queue(), this);
     DCHECK(num_tasks <= queue->length());
     set_pending_microtask_count(0);
@@ skipping 165 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8