Drop unused static microtask API

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 8a99c278cb1da885fcda1f4ef5c34a0f3a6eef12..2cd783b17c681f649dc5bec5010b83089144d9b3 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6454,21 +6454,6 @@ void V8::RemoveMemoryAllocationCallback(MemoryAllocationCallback callback) {
 }
 
 
-void V8::RunMicrotasks(Isolate* isolate) {
-  isolate->RunMicrotasks();
-}
-
-
-void V8::EnqueueMicrotask(Isolate* isolate, Handle<Function> microtask) {
-  isolate->EnqueueMicrotask(microtask);
-}
-
-
-void V8::SetAutorunMicrotasks(Isolate* isolate, bool autorun) {
-  isolate->SetAutorunMicrotasks(autorun);
-}
-
-
 void V8::TerminateExecution(Isolate* isolate) {
   reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->TerminateExecution();
 }