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This CL changes the ownership of base::Clock and base::TickClock from
injectee-owned to injecter-owned. Before this CL, these instances are
owned by the owner of the injectee or one of the injectees themselves.
That makes the ownership complex.

After this CL, the clock instances are always un-owned by injectees.
Instead, an injecter owned one is used on testing, and the shared
instance is used on production path.

Bug: 789079
Change-Id: Ic91e3cbb16c8d66131936b6b4c6e74ed212602c2
Reviewed-on: https://chromium-review.googlesource.com/803154Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521191}