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

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 5400feae77c8f7e215af99b9f3f9942ecb133dc6..15b16fc5df084860991c45cede3574d5a23c9985 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -2653,13 +2653,6 @@ void Isolate::EnqueueMicrotask(Handle<Object> microtask) {
 
 
 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));