Move kSavingBrowserHistoryDisabled to components.

This is in preperation for another change to use it in the tab restore service.

Bug: 869580
Change-Id: I217277b012f03337c57328435319d56ff0fbba49
Reviewed-on: https://chromium-review.googlesource.com/c/1377505
Commit-Queue: Marc-André Decoste <mad@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616653}
20 files changed