Remove static CallCompletedCallback handlers

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index 26cb5a76f616262715ecb9d71fce215f1fefab66..549fd960ac7b995004fb69195718b8104304d272 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -98,10 +98,6 @@ class V8 : public AllStatic {
   // Support for entry hooking JITed code.
   static void SetFunctionEntryHook(FunctionEntryHook entry_hook);
 
-  static void AddCallCompletedCallback(CallCompletedCallback callback);
-  static void RemoveCallCompletedCallback(CallCompletedCallback callback);
-  static void FireCallCompletedCallback(Isolate* isolate);
-
   static void RunMicrotasks(Isolate* isolate);
 
   static v8::ArrayBuffer::Allocator* ArrayBufferAllocator() {
@@ -121,8 +117,6 @@ class V8 : public AllStatic {
   static void InitializeOncePerProcessImpl();
   static void InitializeOncePerProcess();
 
-  // List of callbacks when a Call completes.
-  static List<CallCompletedCallback>* call_completed_callbacks_;
   // Allocator for external array buffers.
   static v8::ArrayBuffer::Allocator* array_buffer_allocator_;
   // v8::Platform to use.