Fix temporary directory leaks in the component updater unit tests.

Bug: 773049
Change-Id: Ib49946e9831e737e7ab65d5566b4601006a4bedf
Reviewed-on: https://chromium-review.googlesource.com/707593
Reviewed-by: Joshua Pawlicki <[email protected]>
Commit-Queue: Sorin Jianu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#507527}
7 files changed