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This CL changes the way the toolbar button associated with a popup menu
is spotlighted. It reduces the alpha of the buttons.
This is used to reduce the alpha of the background of the omnibox button
to prevent confusion between the spotlighted button and the omnibox
button.
It also changes the color of the spotlight in incognito, making it white
instead of dark.

Bug: 817752, 832076
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iee6797945df2e9ec65464ca0393789eb3b581e71
Reviewed-on: https://chromium-review.googlesource.com/1014124Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551272}