Use Unthrottled instead of DOMManipulation in HTMLLinkElement/HTMLStyleElement

third_party/WebKit/Source/core/html/HTMLLinkElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 273 matching lines @@
 void HTMLLinkElement::dispatchPendingEvent(
     std::unique_ptr<IncrementLoadEventDelayCount>) {
   DCHECK(m_link);
   if (m_link->hasLoaded())
     linkLoaded();
   else
     linkLoadingErrored();
 }
 
 void HTMLLinkElement::scheduleEvent() {
-  TaskRunnerHelper::get(TaskType::DOMManipulation, &document())
+  // TODO(hiroshige): Use DOMManipulation task runner. Unthrottled
+  // is temporarily used for fixing https://crbug.com/649942 only on M-56.
+  TaskRunnerHelper::get(TaskType::Unthrottled, &document())
       ->postTask(
           BLINK_FROM_HERE,
           WTF::bind(&HTMLLinkElement::dispatchPendingEvent,
                     wrapPersistent(this),
                     passed(IncrementLoadEventDelayCount::create(document()))));
 }
 
 void HTMLLinkElement::startLoadingDynamicSheet() {
   DCHECK(linkStyle());
   linkStyle()->startLoadingDynamicSheet();
@@ skipping 55 matching lines @@
   LinkLoaderClient::trace(visitor);
   DOMTokenListObserver::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(HTMLLinkElement) {
   visitor->traceWrappers(m_relList);
   HTMLElement::traceWrappers(visitor);
 }
 
 }  // namespace blink