Migrate WTF::Deque::last() to ::back()

third_party/WebKit/Source/core/editing/spellcheck/SpellCheckRequester.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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 189 matching lines @@
     return;
 
   m_processingRequest->dispose();
   m_processingRequest.clear();
 }
 
 void SpellCheckRequester::enqueueRequest(SpellCheckRequest* request) {
   DCHECK(request);
   bool continuation = false;
   if (!m_requestQueue.isEmpty()) {
-    SpellCheckRequest* lastRequest = m_requestQueue.last();
+    SpellCheckRequest* lastRequest = m_requestQueue.back();
     // It's a continuation if the number of the last request got incremented in
     // the new one and both apply to the same editable.
     continuation =
         request->rootEditableElement() == lastRequest->rootEditableElement() &&
         request->requestNumber() == lastRequest->requestNumber() + 1;
   }
 
   // Spellcheck requests for chunks of text in the same element should not
   // overwrite each other.
   if (!continuation) {
@@ skipping 55 matching lines @@
   didCheck(sequence, results);
 }
 
 DEFINE_TRACE(SpellCheckRequester) {
   visitor->trace(m_frame);
   visitor->trace(m_processingRequest);
   visitor->trace(m_requestQueue);
 }
 
 }  // namespace blink