Fix getPrototypeOf for access checked objects

BUG=chromium:509936
LOG=y

Review URL: https://codereview.chromium.org/1242093002

Cr-Commit-Position: refs/heads/master@{#29721}

src/runtime/runtime-object.cc

@@ -193,10 +193,7 @@ MaybeHandle<Object> Runtime::GetPrototype(Isolate* isolate,
     if (PrototypeIterator::GetCurrent(iter)->IsAccessCheckNeeded() &&
         !isolate->MayAccess(
             Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)))) {
-      isolate->ReportFailedAccessCheck(
-          Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)));
-      RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
-      return isolate->factory()->undefined_value();
+      return isolate->factory()->null_value();
     }
     iter.AdvanceIgnoringProxies();
     if (PrototypeIterator::GetCurrent(iter)->IsJSProxy()) {

test/cctest/test-api.cc

@@ -18104,20 +18104,20 @@ THREADED_TEST(Regress93759) {
   CHECK(result1->Equals(simple_object->GetPrototype()));
 
   Local<Value> result2 = CompileRun("Object.getPrototypeOf(protected)");
-  CHECK(result2.IsEmpty());
+  CHECK(result2->IsNull());
 
   Local<Value> result3 = CompileRun("Object.getPrototypeOf(global)");
   CHECK(result3->Equals(global_object->GetPrototype()));
 
   Local<Value> result4 = CompileRun("Object.getPrototypeOf(proxy)");
-  CHECK(result4.IsEmpty());
+  CHECK(result4->IsNull());
 
   Local<Value> result5 = CompileRun("Object.getPrototypeOf(hidden)");
   CHECK(result5->Equals(
       object_with_hidden->GetPrototype()->ToObject(isolate)->GetPrototype()));
 
   Local<Value> result6 = CompileRun("Object.getPrototypeOf(phidden)");
-  CHECK(result6.IsEmpty());
+  CHECK(result6->IsNull());
 }
 
 
@@ -21285,14 +21285,10 @@ TEST(GetPrototypeAccessControl) {
 
   env->Global()->Set(v8_str("prohibited"), obj_template->NewInstance());
 
-  {
-    v8::TryCatch try_catch(isolate);
-    CompileRun(
-        "function f() { %_GetPrototype(prohibited); }"
-        "%OptimizeFunctionOnNextCall(f);"
-        "f();");
-    CHECK(try_catch.HasCaught());
-  }
+  CHECK(CompileRun(
+            "function f() { return %_GetPrototype(prohibited); }"
+            "%OptimizeFunctionOnNextCall(f);"
+            "f();")->IsNull());
 }