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Migrate the About Chrome settings page to the Preference Support
Library. This is the first page migrated, so it includes the
initial set of necessary styles, layouts, and special handling
code to support both Framework and Support Library Preferences
simultaneously. These layouts and styles will be expanded
incrementally as we migrate more complex settings pages.

The net effect of this migration is expected to be a reduction in
method count and binary size, but first CLs will cause increases.

Bug: 966075
Binary-Size: New pref support library usage
Change-Id: I714e7bed76c715357c1055a0f7d4a07211029c29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614475
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665251}