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

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 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
@@ skipping 932 matching lines @@
 
 void Canvas2DLayerBridge::mailboxReleased(const gpu::Mailbox& mailbox,
                                           const gpu::SyncToken& syncToken,
                                           bool lostResource) {
   DCHECK(isAccelerated() || isHibernating());
   bool contextLost =
       !isHibernating() &&
       (!m_surface ||
        m_contextProvider->contextGL()->GetGraphicsResetStatusKHR() !=
            GL_NO_ERROR);
-  DCHECK(m_mailboxes.last().m_parentLayerBridge.get() == this);
+  DCHECK(m_mailboxes.back().m_parentLayerBridge.get() == this);
 
   // Mailboxes are typically released in FIFO order, so we iterate
   // from the end of m_mailboxes.
   auto releasedMailboxInfo = m_mailboxes.end();
   auto firstMailbox = m_mailboxes.begin();
 
   while (true) {
     --releasedMailboxInfo;
     if (releasedMailboxInfo->m_mailbox == mailbox)
       break;
@@ skipping 152 matching lines @@
     default;
 
 void Canvas2DLayerBridge::Logger::reportHibernationEvent(
     HibernationEvent event) {
   DEFINE_STATIC_LOCAL(EnumerationHistogram, hibernationHistogram,
                       ("Canvas.HibernationEvents", HibernationEventCount));
   hibernationHistogram.count(event);
 }
 
 }  // namespace blink