Tidy DEFINE_(THREAD_SAFE_)STATIC_LOCAL() implementations.

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

Index: third_party/WebKit/Source/platform/heap/ThreadState.h
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.h b/third_party/WebKit/Source/platform/heap/ThreadState.h
index 74edd20aefa36099c945f6add4484aa9731d6139..93a2c8596cfed1f87c0334aba4673dee01a239cf 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.h
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.h
@@ -301,6 +301,15 @@ class PLATFORM_EXPORT ThreadState {
     ThreadState* const m_threadState;
   };
 
+#if DCHECK_IS_ON()
+  bool canAllocateScriptWrappable() const { return !m_noScriptWrappableCount; }
+  void enterNoScriptWrappableScope() { m_noScriptWrappableCount++; }
+  void leaveNoScriptWrappableScope() {
+    DCHECK(m_noScriptWrappableCount);
+    m_noScriptWrappableCount--;
+  }
+#endif
+
   void flushHeapDoesNotContainCacheIfNeeded();
 
   // Safepoint related functionality.
@@ -652,6 +661,10 @@ class PLATFORM_EXPORT ThreadState {
   size_t m_noAllocationCount;
   size_t m_gcForbiddenCount;
   size_t m_mixinsBeingConstructedCount;
+#if DCHECK_IS_ON()
+  size_t m_noScriptWrappableCount;
+#endif
+
   double m_accumulatedSweepingTime;
 
   BaseArena* m_arenas[BlinkGC::NumberOfArenas];