metrics: fix memory leaks in unittest.
This fixes the memory leaks exposed in unittest. BUG=chromium:408309 TEST=The memory leak related to |sender_| is gone. Change-Id: I92970d0560f6ccd1ccd7f5022ece8cc5eba4a674 Reviewed-on: https://chromium-review.googlesource.com/214578 Reviewed-by:Yunlian Jiang <yunlian@chromium.org> Tested-by:
Yunlian Jiang <yunlian@chromium.org> Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
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