Remove RenderThreadImpl::Shutdown

third_party/WebKit/Source/wtf/ThreadSpecific.h

Index: third_party/WebKit/Source/wtf/ThreadSpecific.h
diff --git a/third_party/WebKit/Source/wtf/ThreadSpecific.h b/third_party/WebKit/Source/wtf/ThreadSpecific.h
index 82f2144132138057f3ca924f9c1d4a1ae370fb75..5d7f6d26a9eba250c76907a791b1e34b80de2c5d 100644
--- a/third_party/WebKit/Source/wtf/ThreadSpecific.h
+++ b/third_party/WebKit/Source/wtf/ThreadSpecific.h
@@ -224,7 +224,9 @@ inline void ThreadSpecific<T>::set(T* ptr) {
 
 template <typename T>
 inline void ThreadSpecific<T>::destroy(void* ptr) {
-  if (isShutdown())
+  // Never call destructors on the main thread.
+  // This is fine because Blink no longer has a graceful shutdown sequence.
+  if (isMainThread())
     return;
 
   Data* data = static_cast<Data*>(ptr);