GitLab

This CL fixes the theme service to be able to toggle native increased
contrast support.
We were not considering IncreasedContrastThemeSupplier as a default
theme and were not removing it when native increased contrast was
disabled.

Bug: 1056335
Change-Id: I42b59e58912de8224b3d7d4e84fb355cd7851dc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078376
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746686}