Macos re-enable TestSetMenu (#37058)

Author: Chris Yang

shell/platform/darwin/macos/framework/Source/FlutterMenuPluginTest.mm

@@ -25,6 +25,11 @@ - (bool)testSetMenu;
 @implementation FlutterMenuPluginTestObjc
 
 - (bool)testSetMenu {
+  // Workaround to deflake the test.
+  // See: https://github.com/flutter/flutter/issues/104748#issuecomment-1159336728
+  NSView* view = [[NSView alloc] initWithFrame:NSZeroRect];
+  view.wantsLayer = YES;
+
   // Build a simulation of the default main menu.
   NSMenu* mainMenu = [[NSMenu alloc] init];
   NSMenuItem* appNameMenu = [[NSMenuItem alloc] initWithTitle:@"APP_NAME"
@@ -175,9 +180,7 @@ - (bool)testSetMenu {
 @end
 
 namespace flutter::testing {
-// TODO(gspencergoog): Re-enabled when deflaked
-// https://github.com/flutter/flutter/issues/106589
-TEST(FlutterMenuPluginTest, DISABLED_TestSetMenu) {
+TEST(FlutterMenuPluginTest, TestSetMenu) {
   ASSERT_TRUE([[FlutterMenuPluginTestObjc alloc] testSetMenu]);
 }
 }  // namespace flutter::testing