Remove unused trace sampling states

sky/engine/platform/EventTracer.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:
  *
  *     * 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 32 matching lines @@
 typedef uint64_t TraceEventHandle;
 
 class PLATFORM_EXPORT ConvertableToTraceFormat : public RefCounted<ConvertableToTraceFormat> {
 public:
     virtual String asTraceFormat() const = 0;
     virtual ~ConvertableToTraceFormat() { }
 };
 
 }
 
-// FIXME: Make these global variables thread-safe. Make a value update atomic.
-PLATFORM_EXPORT extern long* traceSamplingState[3];
-
 class PLATFORM_EXPORT EventTracer {
 public:
-    static void initialize();
     static const unsigned char* getTraceCategoryEnabledFlag(const char*);
     static TraceEvent::TraceEventHandle addTraceEvent(char phase,
         const unsigned char* categoryEnabledFlag,
         const char* name,
         unsigned long long id,
         int numArgs,
         const char* argNames[],
         const unsigned char argTypes[],
         const unsigned long long argValues[],
         TraceEvent::ConvertableToTraceFormat*[],
         unsigned char flags);
     static TraceEvent::TraceEventHandle addTraceEvent(char phase,
         const unsigned char* categoryEnabledFlag,
         const char* name,
         unsigned long long id,
         int numArgs,
         const char* argNames[],
         const unsigned char argTypes[],
         const unsigned long long argValues[],
         unsigned char flags);
     static void updateTraceEventDuration(const unsigned char* categoryEnabledFlag, const char* name, TraceEvent::TraceEventHandle);
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PLATFORM_EVENTTRACER_H_