remove reference to Parser::Internalize, which is gone now

BUG=v8:5203

Change-Id: I088145e83877fad1b15476757f528e5f1e9cdf54
Reviewed-on: https://chromium-review.googlesource.com/511442
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@opera.com>
Cr-Commit-Position: refs/heads/master@{#45482}

src/parsing/parser.cc

@@ -3532,7 +3532,7 @@ void Parser::ParseOnBackground(ParseInfo* info) {
   info->set_literal(result);
 
   // We cannot internalize on a background thread; a foreground task will take
-  // care of calling Parser::Internalize just before compilation.
+  // care of calling AstValueFactory::Internalize just before compilation.
 
   if (produce_cached_parse_data()) {
     if (result != NULL) *info->cached_data() = logger.GetScriptData();