Remove unused trace sampling states

sky/engine/core/Init.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 51 matching lines @@
     FontFamilyNames::init();
     MediaFeatureNames::init();
     MediaTypeNames::init();
 
     // It would make logical sense to do this in WTF::initialize() but there are
     // ordering dependencies, e.g. about "xmlns".
     WTF::StringStatics::init();
 
     QualifiedName::init();
     Partitions::init();
-    EventTracer::initialize();
 
     // Ensure that the main thread's thread-local data is initialized before
     // starting any worker threads.
     PlatformThreadData::current();
 
     StringImpl::freezeStaticStrings();
 
     HTMLParserThread::start();
 }
 
 void CoreInitializer::shutdown()
 {
     HTMLParserThread::stop();
     Partitions::shutdown();
 }
 
 } // namespace blink