Revert "Expose v8::Function::GetDisplayName to public API."

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 2ff60c4a2e4c768966fbe86627eb5e8c63d62324..8e07b1a2e04b1035e6ddc0a1f8da4504f90bf749 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4110,30 +4110,6 @@ Handle<Value> Function::GetInferredName() const {
 }
 
 
-Handle<Value> Function::GetDisplayName() const {
-  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  ON_BAILOUT(isolate, "v8::Function::GetDisplayName()",
-             return ToApiHandle<Primitive>(
-                isolate->factory()->undefined_value()));
-  ENTER_V8(isolate);
-  i::HandleScope scope(isolate);
-  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
-  i::Handle<i::String> property_name =
-      isolate->factory()->InternalizeOneByteString(
-          STATIC_ASCII_VECTOR("displayName"));
-  i::LookupResult lookup(isolate);
-  func->LookupRealNamedProperty(*property_name, &lookup);
-  if (lookup.IsFound()) {
-    i::Object* value = lookup.GetLazyValue();
-    if (value && value->IsString()) {
-      i::String* name = i::String::cast(value);
-      if (name->length() > 0) return Utils::ToLocal(i::Handle<i::String>(name));
-    }
-  }
-  return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
-}
-
-
 ScriptOrigin Function::GetScriptOrigin() const {
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   if (func->shared()->script()->IsScript()) {