Cleanup: Remove unused declaration of __libc_stack_end

third_party/WebKit/Source/platform/heap/ThreadState.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 34 matching lines @@
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/DataLog.h"
 #include "wtf/Partitions.h"
 #include "wtf/ThreadingPrimitives.h"
 
 #if OS(WIN)
 #include <stddef.h>
 #include <windows.h>
 #include <winnt.h>
-#elif defined(__GLIBC__)
-extern "C" void* __libc_stack_end;  // NOLINT
 #endif
 
 #if defined(MEMORY_SANITIZER)
 #include <sanitizer/msan_interface.h>
 #endif
 
 #if OS(FREEBSD)
 #include <pthread_np.h>
 #endif
 
@@ skipping 1442 matching lines @@
     threadDump->addScalar("dead_count", "objects", totalDeadCount);
     threadDump->addScalar("live_size", "bytes", totalLiveSize);
     threadDump->addScalar("dead_size", "bytes", totalDeadSize);
 
     WebMemoryAllocatorDump* heapsDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(heapsDumpName);
     WebMemoryAllocatorDump* classesDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(classesDumpName);
     BlinkGCMemoryDumpProvider::instance()->currentProcessMemoryDump()->addOwnershipEdge(classesDump->guid(), heapsDump->guid());
 }
 
 } // namespace blink