Removed V8WorkerOrWorkletEventListener::GetReceiverObject()

Removed V8WorkerOrWorkletEventListener::GetReceiverObject() because its
behavior is equivalent to V8AbstractEventListener::getReceiverObject()
as commented in FIXME.

Bug: 869778
Change-Id: If000f1351ec1ab2d5904c853a1dddc2be9d96648
Reviewed-on: https://chromium-review.googlesource.com/1158318
Commit-Queue: Yuki Yamada <yukiy@google.com>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580083}

third_party/blink/renderer/bindings/core/v8/v8_worker_or_worklet_event_listener.cc

@@ -90,24 +90,4 @@ v8::Local<v8::Value> V8WorkerOrWorkletEventListener::CallListenerFunction(
   return result;
 }
 
-// FIXME: Remove getReceiverObject().
-// This is almost identical to V8AbstractEventListener::getReceiverObject().
-v8::Local<v8::Object> V8WorkerOrWorkletEventListener::GetReceiverObject(
-    ScriptState* script_state,
-    Event* event) {
-  v8::Local<v8::Object> listener =
-      GetListenerObject(ExecutionContext::From(script_state));
-
-  if (!listener.IsEmpty() && !listener->IsFunction())
-    return listener;
-
-  EventTarget* target = event->currentTarget();
-  v8::Local<v8::Value> value =
-      ToV8(target, script_state->GetContext()->Global(), GetIsolate());
-  if (value.IsEmpty())
-    return v8::Local<v8::Object>();
-  return v8::Local<v8::Object>::New(GetIsolate(),
-                                    v8::Local<v8::Object>::Cast(value));
-}
-
 }  // namespace blink

third_party/blink/renderer/bindings/core/v8/v8_worker_or_worklet_event_listener.h

@@ -61,7 +61,6 @@ class V8WorkerOrWorkletEventListener final : public V8EventListener {
   v8::Local<v8::Value> CallListenerFunction(ScriptState*,
                                             v8::Local<v8::Value>,
                                             Event*) override;
-  v8::Local<v8::Object> GetReceiverObject(ScriptState*, Event*);
 };
 
 }  // namespace blink