Avoid WTF::Vector::at() and operator[] in core/events.

third_party/WebKit/Source/core/events/ScopedEventQueue.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
   if (shouldQueueEvents())
     m_queuedEventDispatchMediators.append(mediator);
   else
     dispatchEvent(mediator);
 }
 
 void ScopedEventQueue::dispatchAllEvents() {
   HeapVector<Member<EventDispatchMediator>> queuedEventDispatchMediators;
   queuedEventDispatchMediators.swap(m_queuedEventDispatchMediators);
 
-  for (size_t i = 0; i < queuedEventDispatchMediators.size(); i++)
-    dispatchEvent(queuedEventDispatchMediators[i].release());
+  for (auto& mediator : queuedEventDispatchMediators)
+    dispatchEvent(mediator.release());
 }
 
 void ScopedEventQueue::dispatchEvent(EventDispatchMediator* mediator) const {
   DCHECK(mediator->event().target());
   Node* node = mediator->event().target()->toNode();
   EventDispatcher::dispatchEvent(*node, mediator);
 }
 
 ScopedEventQueue* ScopedEventQueue::instance() {
   if (!s_instance)
     initialize();
 
   return s_instance;
 }
 
 void ScopedEventQueue::incrementScopingLevel() {
   m_scopingLevel++;
 }
 
 void ScopedEventQueue::decrementScopingLevel() {
   DCHECK(m_scopingLevel);
   m_scopingLevel--;
   if (!m_scopingLevel)
     dispatchAllEvents();
 }
 
 }  // namespace blink