Revert assertion change from r21933 in Isolate::RunMicrotasks().

R=marja@chromium.org

Review URL: https://codereview.chromium.org/357453002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21971 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.cc

@@ -2292,10 +2292,12 @@ void Isolate::EnqueueMicrotask(Handle<Object> microtask) {
 
 
 void Isolate::RunMicrotasks() {
-  // In some mjsunit tests %RunMicrotasks is called explicitly, violating
-  // this assertion.  Therefore we also check for --allow-natives-syntax.
-  ASSERT(FLAG_allow_natives_syntax ||
-         handle_scope_implementer()->CallDepthIsZero());
+  // %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.
+  //
+  // ASSERT(FLAG_allow_natives_syntax ||
+  //        handle_scope_implementer()->CallDepthIsZero());
 
   // Increase call depth to prevent recursive callbacks.
   v8::Isolate::SuppressMicrotaskExecutionScope suppress(