[init] Error cause should not present on Error.prototype

According to the spec https://tc39.github.io/proposal-error-cause,
the property 'cause' should not present on Error.prototype.

Bug: v8:12006
Change-Id: Ib1601769793b808c5f5a7065effcc77d1def4cbb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3037911Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75872}

src/init/bootstrapper.cc

@@ -1436,11 +1436,6 @@ static void InstallError(Isolate* isolate, Handle<JSObject> global,
     JSObject::AddProperty(isolate, prototype, factory->message_string(),
                           factory->empty_string(), DONT_ENUM);
 
-    if (FLAG_harmony_error_cause) {
-      JSObject::AddProperty(isolate, prototype, factory->cause_string(),
-                            factory->undefined_value(), DONT_ENUM);
-    }
-
     if (context_index == Context::ERROR_FUNCTION_INDEX) {
       Handle<JSFunction> to_string_fun =
           SimpleInstallFunction(isolate, prototype, "toString",

test/mjsunit/harmony/error-cause.js

@@ -19,6 +19,8 @@
 (function () {
   const err = Error('message');
   assertEquals(undefined, err.cause);
+  assertFalse('cause' in err);
+  assertFalse('cause' in Error.prototype);
 })();
 
 // Chained errors