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This was used only to guard calls to the static method
LayoutThemeDefault::SetSelectionColors. This static methods should
have been virtual on blink::LayoutTheme to begin with. It also
shouldn't be routed through blink::WebView (rather, it should be
called directly, like the adjacent blink::SetFocusRingColor).

Note that after changing selection colors, we call both
blink::WebWidget::ThemeChanged and blink::Page::PlatformColorsChanged.
I don't know the distinction between the two.

Bug: 961342
Change-Id: I3edd3d41d6ad6de1fc3331bb03308f2dc7c6a683
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606185
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659136}