Add GetProperty/GetElement to JSReceiver and use it where possible

test/cctest/test-object-observe.cc

Index: test/cctest/test-object-observe.cc
diff --git a/test/cctest/test-object-observe.cc b/test/cctest/test-object-observe.cc
index 5164b87df7517c034c182d860e2fe8272a2c372d..f17b8c081e29d21d545ca16211ed0d32812e43ce 100644
--- a/test/cctest/test-object-observe.cc
+++ b/test/cctest/test-object-observe.cc
@@ -491,16 +491,17 @@ TEST(ObservationWeakMap) {
   i::Isolate* i_isolate = CcTest::i_isolate();
   i::Handle<i::JSObject> observation_state =
       i_isolate->factory()->observation_state();
-  i::Handle<i::JSWeakMap> callbackInfoMap =
-      i::Handle<i::JSWeakMap>::cast(i::Object::GetProperty(
-          i_isolate, observation_state, "callbackInfoMap").ToHandleChecked());
-  i::Handle<i::JSWeakMap> objectInfoMap =
-      i::Handle<i::JSWeakMap>::cast(i::Object::GetProperty(
-          i_isolate, observation_state, "objectInfoMap").ToHandleChecked());
-  i::Handle<i::JSWeakMap> notifierObjectInfoMap =
-      i::Handle<i::JSWeakMap>::cast(i::Object::GetProperty(
-          i_isolate, observation_state, "notifierObjectInfoMap")
-              .ToHandleChecked());
+  i::Handle<i::JSWeakMap> callbackInfoMap = i::Handle<i::JSWeakMap>::cast(
+      i::JSReceiver::GetProperty(i_isolate, observation_state,
+                                 "callbackInfoMap")
+          .ToHandleChecked());
+  i::Handle<i::JSWeakMap> objectInfoMap = i::Handle<i::JSWeakMap>::cast(
+      i::JSReceiver::GetProperty(i_isolate, observation_state, "objectInfoMap")
+          .ToHandleChecked());
+  i::Handle<i::JSWeakMap> notifierObjectInfoMap = i::Handle<i::JSWeakMap>::cast(
+      i::JSReceiver::GetProperty(i_isolate, observation_state,
+                                 "notifierObjectInfoMap")
+          .ToHandleChecked());
   CHECK_EQ(1, NumberOfElements(callbackInfoMap));
   CHECK_EQ(1, NumberOfElements(objectInfoMap));
   CHECK_EQ(1, NumberOfElements(notifierObjectInfoMap));