Migrate WTF::LinkedHashSet/ListHashSet::first() to ::front()

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. 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.
@@ skipping 515 matching lines @@
   // contained inside the requested rect. (Note that -1/2 is 0.)
   LayoutSize padding((documentRect.width() - 1) / 2,
                      (documentRect.height() - 1) / 2);
   HitTestResult result = frame->eventHandler().hitTestResultAtPoint(
       center, HitTestRequest::ReadOnly | HitTestRequest::Active |
                   HitTestRequest::ListBased,
       padding);
   const HitTestResult::NodeSet& nodes = result.listBasedTestResult();
   if (nodes.size() != 1)
     return false;
-  return nodes.first().get() == m_element;
+  return nodes.front().get() == m_element;
 }
 
 void WebPluginContainerImpl::requestTouchEventType(
     TouchEventRequestType requestType) {
   if (m_touchEventRequestType == requestType || !m_element)
     return;
 
   if (FrameHost* frameHost = m_element->document().frameHost()) {
     EventHandlerRegistry& registry = frameHost->eventHandlerRegistry();
     if (requestType != TouchEventRequestTypeNone &&
@@ skipping 439 matching lines @@
     // frame view.
     computeClipRectsForPlugin(m_element, windowRect, clipRect, unobscuredRect);
   }
   getPluginOcclusions(m_element, this->parent(), frameRect(), cutOutRects);
   // Convert to the plugin position.
   for (size_t i = 0; i < cutOutRects.size(); i++)
     cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 }  // namespace blink