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

third_party/WebKit/Source/core/timing/PerformanceBase.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 262 matching lines @@
                                                    *securityOrigin, context);
 
   if (!allowRedirectDetails) {
     ResourceLoadTiming* finalTiming = finalResponse.resourceLoadTiming();
     ASSERT(finalTiming);
     if (finalTiming)
       startTime = finalTiming->requestTime();
   }
 
   ResourceLoadTiming* lastRedirectTiming =
-      redirectChain.last().resourceLoadTiming();
+      redirectChain.back().resourceLoadTiming();
   ASSERT(lastRedirectTiming);
   double lastRedirectEndTime = lastRedirectTiming->receiveHeadersEnd();
 
   PerformanceEntry* entry = PerformanceResourceTiming::create(
       info, timeOrigin(), startTime, lastRedirectEndTime, allowTimingDetails,
       allowRedirectDetails);
   notifyObserversOfEntry(*entry);
   if (!isResourceTimingBufferFull())
     addResourceTimingBuffer(*entry);
 }
@@ skipping 171 matching lines @@
   visitor->trace(m_frameTimingBuffer);
   visitor->trace(m_resourceTimingBuffer);
   visitor->trace(m_userTiming);
   visitor->trace(m_observers);
   visitor->trace(m_activeObservers);
   visitor->trace(m_suspendedObservers);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink