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WallClockTimer is able to run the task with wall clock delay which is not
paused when the computer is sleep.

WallClockTimer is currently in relaunch_notification component. enterprise
reporting will temporarily depends on it. WallClockTimer will be moved into
base later.

Also, removing the RequestTimer and let ReportScheduler use WallClockTimer
directly.

Bug: 1039673
Change-Id: Ic3a2c695717c9fee6af5172d7a12e2afb2ed561b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005648
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734125}