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(1) Modified code so that tablet
mode updating will enable/disable display
orientation in setting page.

(2) Code refactoring: move all of methods
related with display information in
SystemInfoApi::SystemInfoEventRouter to
DisplayInfoProvider and its subclasses.

In the previous code, tablet mode's change
will not affect display orientation when
setting page has already shown. As result,
when opening setting page then changing
laptop to tablet mode, user is still able
to modify display orientation. After
investigation, the bug reason is that in
ChromeOS change in tablet mode will not
trigger OnDisplayChanged event.

Bug: 889625
Change-Id: Ic526ec54e6c01cd14a0d4a7e883774b9fafed268
Reviewed-on: https://chromium-review.googlesource.com/c/1264544
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599846}