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This patch moves the white status bar theme to a version specific
v23 directory to prevent L and below devices from using the flashing
between colors. Logic has also been added to ChromeActivity to prevent
these devices from using the grey (darkened version of white) color on
startup.

Bug: 881239
Change-Id: I41e5d959fab96623d254f4ff2dd0ea15cb6f9abc
Reviewed-on: https://chromium-review.googlesource.com/1228496
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591857}