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Previously, storage::FileSystemUsageCache used a custom timer
implementation (TimedTaskHelper). Crash involving this custom timer
implementation have been reported (e.g. http://crash/e2c6ff1ef4863460).
Therefore, we are moving all uses of TimedTaskHelper to the well
maintained base::Timer.

Note: The TaskRunner passed to the TimedTaskHelper in
storage::FileSystemUsageCache was always the one on which the
storage::FileSystemUsageCache was used, so there is no need to
an explicit call to base::Timer::SetTaskRunner in this CL.

Bug: 760326
Change-Id: I4b0727e4f70c2560a2948015dd28236cd760a9f3
Reviewed-on: https://chromium-review.googlesource.com/1012586
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551525}