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With CL:2587618, we no longer need to check for a Windows dependency
in NativeThemeBase::GetControlColor(). Instead, we can call
InForcedColorsMode(), which in practice is only ever true on
Windows.

There is work underway to add a devtools emulation feature for Windows
high contrast to allow developers to test their webpages in forced
colors mode without a Windows device. This change will likely allow
for controls to be rendered correctly in this case.

This CL should not result in any functional changes.

Bug: 1107431
Change-Id: I268e73ea574dd55c535ae3bb031c1d06b84d1d48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590589
Commit-Queue: Alison Maher <almaher@microsoft.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#840200}