Due to the latest changes in topsites area, I believe this issue has become obsolete. Cleaning up and closing it as WFM, please reopen if I missed something.
Bug 1422882 Comment 9 Edit History
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In the given scenario, dismiss will remove one google instance to remove it with the next, which in a sense would make this bug still valid. However, the delete history would remove all the instances, hence achieving in my view the desired result. Resolving as WFM, due to above, please reopen if incorrect.
In the given scenario, dismiss will remove one google instance to remove it with the next, which in a sense would make this bug still valid. However, the delete history option from the tile management menu would remove all the instances, hence achieving in my view the desired result. Resolving as WFM, due to above, please reopen if incorrect.