[Parser] Don't internalize on-the-fly.

src/ast/ast-value-factory.h

Index: src/ast/ast-value-factory.h
diff --git a/src/ast/ast-value-factory.h b/src/ast/ast-value-factory.h
index e3d2cc63775c039a63877889237a40e932e9c797..211b86646740eeb948904bfc91108af7f39b0321 100644
--- a/src/ast/ast-value-factory.h
+++ b/src/ast/ast-value-factory.h
@@ -329,7 +329,6 @@ class AstValueFactory {
         values_(nullptr),
         strings_end_(&strings_),
         zone_(zone),
-        isolate_(NULL),
         hash_seed_(hash_seed) {
     ResetStrings();
 #define F(name, str) name##_string_ = NULL;
@@ -359,9 +358,6 @@ class AstValueFactory {
                                     const AstRawString* right);
 
   void Internalize(Isolate* isolate);
-  bool IsInternalized() {
-    return isolate_ != NULL;
-  }
 
 #define F(name, str)                                                    \
   const AstRawString* name##_string() {                                 \
@@ -389,21 +385,13 @@ class AstValueFactory {
 
  private:
   AstValue* AddValue(AstValue* value) {
-    if (isolate_) {
-      value->Internalize(isolate_);
-    } else {
-      value->set_next(values_);
-      values_ = value;
-    }
+    value->set_next(values_);
+    values_ = value;
     return value;
   }
   AstString* AddString(AstString* string) {
-    if (isolate_) {
-      string->Internalize(isolate_);
-    } else {
-      *strings_end_ = string;
-      strings_end_ = string->next_location();
-    }
+    *strings_end_ = string;
+    strings_end_ = string->next_location();
     return string;
   }
   void ResetStrings() {
@@ -427,7 +415,6 @@ class AstValueFactory {
   AstString* strings_;
   AstString** strings_end_;
   Zone* zone_;
-  Isolate* isolate_;
 
   uint32_t hash_seed_;