Remove Heap::IsPowerOf2().

Source/platform/heap/Heap.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 59 matching lines @@
         return gcInfo->m_className;
     return "unknown";
 }
 #endif
 
 static bool vTableInitialized(void* objectPointer)
 {
     return !!(*reinterpret_cast<Address*>(objectPointer));
 }
 
-#if OS(WIN)
-static bool IsPowerOf2(size_t power)
-{
-    return !((power - 1) & power);
-}
-#endif
-
 static Address roundToBlinkPageBoundary(void* base)
 {
     return reinterpret_cast<Address>((reinterpret_cast<uintptr_t>(base) + blinkPageOffsetMask) & blinkPageBaseMask);
 }
 
 static size_t roundToOsPageSize(size_t size)
 {
     return (size + WTF::kSystemPageSize - 1) & ~(WTF::kSystemPageSize - 1);
 }
 
@@ skipping 2615 matching lines @@
 bool Heap::s_shutdownCalled = false;
 bool Heap::s_lastGCWasConservative = false;
 FreePagePool* Heap::s_freePagePool;
 OrphanedPagePool* Heap::s_orphanedPagePool;
 Heap::RegionTree* Heap::s_regionTree = nullptr;
 size_t Heap::s_allocatedObjectSize = 0;
 size_t Heap::s_allocatedSpace = 0;
 size_t Heap::s_markedObjectSize = 0;
 
 } // namespace blink