Thread isolate through Property constructor, avoiding Isolate::Current.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 9425d6a248918cfb30c0a04345569c8f370bc8c4..9810c3450429f99bb3bdfb130fa15acd13303674 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -168,12 +168,15 @@ LanguageMode FunctionLiteral::language_mode() const {
 }
 
 
-ObjectLiteral::Property::Property(Literal* key, Expression* value) {
+ObjectLiteral::Property::Property(Literal* key,
+                                  Expression* value,
+                                  Isolate* isolate) {
   emit_store_ = true;
   key_ = key;
   value_ = value;
   Object* k = *key->handle();
-  if (k->IsSymbol() && HEAP->Proto_symbol()->Equals(String::cast(k))) {
+  if (k->IsSymbol() &&
+      isolate->heap()->Proto_symbol()->Equals(String::cast(k))) {
     kind_ = PROTOTYPE;
   } else if (value_->AsMaterializedLiteral() != NULL) {
     kind_ = MATERIALIZED_LITERAL;