WTF/std normalization: replace WTF::Vector::last with ::back

third_party/WebKit/Source/core/dom/Fullscreen.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 452 matching lines @@
     if (fullscreenElementFrom(*toLocalFrame(descendant)->document()))
       descendants.prepend(toLocalFrame(descendant)->document());
   }
 
   // 4. For each descendant in descendants, empty descendant's fullscreen
   // element stack, and queue a task to fire an event named fullscreenchange
   // with its bubbles attribute set to true on descendant.
   for (auto& descendant : descendants) {
     DCHECK(descendant);
     RequestType requestType =
-        from(*descendant).m_fullscreenElementStack.last().second;
+        from(*descendant).m_fullscreenElementStack.back().second;
     from(*descendant).clearFullscreenElementStack();
     from(document).enqueueChangeEvent(*descendant, requestType);
   }
 
   // 5. While doc is not null, run these substeps:
   Element* newTop = nullptr;
   for (Document* currentDoc = &document; currentDoc;) {
     RequestType requestType =
-        from(*currentDoc).m_fullscreenElementStack.last().second;
+        from(*currentDoc).m_fullscreenElementStack.back().second;
 
     // 1. Pop the top element of doc's fullscreen element stack.
     from(*currentDoc).popFullscreenElementStack();
 
     //    If doc's fullscreen element stack is non-empty and the element now at
     //    the top is either not in a document or its node document is not doc,
     //    repeat this substep.
     newTop = fullscreenElementFrom(*currentDoc);
     if (newTop && (!newTop->isConnected() || newTop->document() != currentDoc))
       continue;
@@ skipping 269 matching lines @@
 
 DEFINE_TRACE(Fullscreen) {
   visitor->trace(m_currentFullScreenElement);
   visitor->trace(m_fullscreenElementStack);
   visitor->trace(m_eventQueue);
   Supplement<Document>::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink