Follow these simple steps to remove Gmail or Gmail plus account from Huawei Ascend Android Phone:
1. Open Settings, tap on the Accounts and sync.
2. Tap the name of the account you wish to remove/delete, in your case Gmail account.
3. Tap Remove account
4. Confirm that you want to remove the Gmail account by tapping on Remove account.
5. Your account will now be deleted.
Now your problem should be solved