More switching to standard type traits

third_party/WebKit/Source/platform/TraceEvent.h

 /*
  * Copyright (C) 2011 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 372 matching lines @@
 
 template<typename T> struct ConvertableToTraceFormatTraits {
     static const bool isConvertable = false;
     static PassRefPtr<ConvertableToTraceFormat> moveFromIfConvertable(const T&)
     {
         return nullptr;
     }
 };
 
 template<typename T> struct ConvertableToTraceFormatTraits<PassRefPtr<T>> {
-    static const bool isConvertable = WTF::IsSubclass<T, TraceEvent::ConvertableToTraceFormat>::value;
+    static const bool isConvertable = std::is_convertible<T*, TraceEvent::ConvertableToTraceFormat*>::value;
     static PassRefPtr<ConvertableToTraceFormat> moveFromIfConvertable(const PassRefPtr<T>& convertableToTraceFormat)
     {
         return convertableToTraceFormat;
     }
 };
 
 template<typename T> bool isConvertableToTraceFormat(const T&)
 {
     return ConvertableToTraceFormatTraits<T>::isConvertable;
 }
@@ skipping 218 matching lines @@
     const char* m_categoryGroup;
     const char* m_name;
     IDType m_id;
 };
 
 } // namespace TraceEvent
 
 } // namespace blink
 
 #endif