remove test that is dependent on other tests (#6021)

Author: charlotteliang

FirebaseMessaging/Tests/UnitTests/FIRMessagingRemoteNotificationsProxyTest.m

@@ -316,29 +316,6 @@ - (void)testSwizzlingInvalidUserNotificationCenterDelegate {
   }
 }
 
-- (void)testSwizzlingUserNotificationsCenterDelegate {
-#if TARGET_OS_IOS || TARGET_OS_OSX
-  if (@available(macOS 10.14, iOS 10.0, *)) {
-    FakeUserNotificationCenterDelegate *delegate =
-        [[FakeUserNotificationCenterDelegate alloc] init];
-    OCMStub([self.mockUserNotificationCenter delegate]).andReturn(delegate);
-    [self.proxy swizzleMethodsIfPossible];
-
-    NSDictionary *message = @{@"message" : @""};
-    id notification = [self userNotificationWithMessage:message];
-
-    OCMExpect([self.mockMessaging appDidReceiveMessage:message]);
-
-    [delegate userNotificationCenter:self.mockUserNotificationCenter
-             willPresentNotification:notification
-               withCompletionHandler:^(UNNotificationPresentationOptions options){
-               }];
-
-    [self.mockMessaging verify];
-  }
-#endif
-}
-
 // Use a fake delegate that doesn't actually implement the needed delegate method.
 // Our swizzled method should not be called.