Use C++11 features in core/timing

Source/core/timing/Performance.h

 /*
  * 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 35 matching lines @@
 
 namespace blink {
 
 class Document;
 class ExceptionState;
 class ResourceRequest;
 class ResourceResponse;
 class ResourceTimingInfo;
 class UserTiming;
 
-typedef WillBeHeapVector<RefPtrWillBeMember<PerformanceEntry> > PerformanceEntryVector;
+using PerformanceEntryVector = WillBeHeapVector<RefPtrWillBeMember<PerformanceEntry>>;
 
 class Performance final : public RefCountedWillBeGarbageCollectedFinalized<Performance>, public DOMWindowProperty, public EventTargetWithInlineData {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_EVENT_TARGET(Performance);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Performance);
 public:
     static PassRefPtrWillBeRawPtr<Performance> create(LocalFrame* frame)
     {
         return adoptRefWillBeNoop(new Performance(frame));
     }
@@ skipping 38 matching lines @@
     PerformanceEntryVector m_resourceTimingBuffer;
     unsigned m_resourceTimingBufferSize;
     double m_referenceTime;
 
     RefPtrWillBeMember<UserTiming> m_userTiming;
 };
 
 } // namespace blink
 
 #endif // Performance_h