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The NativeThemeGtk instance is able to detect high contrast changes
in the system by reading the GTK theme name. NativeThemeAura is not
capable of doing this however, and is never aware of the true state of
high contrast in the system. With this change, NativeThemeGtk will
update NativeThemeAura when high contrast changes.

Bug: 1157686
Change-Id: I6f0407dd639a1d61d1d7f99fccd2122cb0fdc669
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586068
Commit-Queue: Andres Pico <anpico@microsoft.com>
Reviewed-by: Alison Maher <almaher@microsoft.com>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846188}