Revert of Precisely determine Windows thread stack size.

third_party/WebKit/Source/platform/heap/ThreadState.h

 /*
  * 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 558 matching lines @@
         return m_heaps[heapIndex];
     }
     BaseHeap* expandedVectorBackingHeap(size_t gcInfoIndex);
     static bool isVectorHeapIndex(int heapIndex)
     {
         return BlinkGC::Vector1HeapIndex <= heapIndex && heapIndex <= BlinkGC::Vector4HeapIndex;
     }
     void allocationPointAdjusted(int heapIndex);
     void promptlyFreed(size_t gcInfoIndex);
 
-#if OS(WIN) && COMPILER(MSVC)
-    size_t threadStackSize();
-#endif
-
 private:
     enum SnapshotType {
         HeapSnapshot,
         FreelistSnapshot
     };
 
     ThreadState();
     ~ThreadState();
 
     NO_SANITIZE_ADDRESS void copyStackUntilSafePointScope();
@@ skipping 87 matching lines @@
     // We would like to manage lifetime of the ThreadState attached
     // to the main thread explicitly instead and still use normal
     // constructor and destructor for the ThreadState class.
     // For this we reserve static storage for the main ThreadState
     // and lazily construct ThreadState in it using placement new.
     static uint8_t s_mainThreadStateStorage[];
 
     ThreadIdentifier m_thread;
     OwnPtr<PersistentRegion> m_persistentRegion;
     BlinkGC::StackState m_stackState;
-#if OS(WIN) && COMPILER(MSVC)
-    size_t m_threadStackSize;
-#endif
     intptr_t* m_startOfStack;
     intptr_t* m_endOfStack;
-
     void* m_safePointScopeMarker;
     Vector<Address> m_safePointStackCopy;
     bool m_atSafePoint;
     InterruptorVector m_interruptors;
     bool m_sweepForbidden;
     size_t m_noAllocationCount;
     size_t m_gcForbiddenCount;
     BaseHeap* m_heaps[BlinkGC::NumberOfHeaps];
 
     int m_vectorBackingHeapIndex;
@@ skipping 45 matching lines @@
 };
 
 template<> class ThreadStateFor<AnyThread> {
 public:
     static ThreadState* state() { return ThreadState::current(); }
 };
 
 } // namespace blink
 
 #endif // ThreadState_h