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It can be annoying to remember the capture region from previous sessions
that happen long time ago. This CL adds a 8 minutes timeout to forget
the capture region since the last time the user selected one. Note the
timer starts on the last time the user selected a capture region from
the previous session and will be used to compare with the current
session start time to see if we need to clear the capture region.

Bug: 1159117
Change-Id: Idc8c47f6272eb7b41e912a737b2c52fed7f1750a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594558
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838507}