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Now is up to the component embedding the SystemInfo API to implement
the DisplayInfoProvider. The motivation for this change is we want to
move the SystemInfo API to extensions/ but DisplayInfoProvider depends
on ash/, which will link with ui/views/, and that is way too big.

The ultimate goal is to have SystemInfo on the app_shell without increasing its
footprint considerably.

BUG=392842

Review URL: https://codereview.chromium.org/476103002

Cr-Commit-Position: refs/heads/master@{#291250}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291250 0039d316-1c4b-4281-b951-d872f2087c98