Don't execute scripts on stopped parser.

Test: interactive_ui_tests OobeTest.NewUser
Bug: 742695
Change-Id: I1779bc181f4c393ec74e523e346da601d1da6eef
Reviewed-on: https://chromium-review.googlesource.com/571525Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486692}

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

@@ -1131,6 +1131,9 @@ void HTMLDocumentParser::NotifyScriptLoaded(PendingScript* pending_script) {
 }
 
 void HTMLDocumentParser::ExecuteScriptsWaitingForResources() {
+  if (IsStopped())
+    return;
+
   DCHECK(GetDocument()->IsScriptExecutionReady());
 
   if (is_waiting_for_stylesheets_)