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This CL changes the method name of NewTabPageControllerDelegate allowing
the NTP to change the color of the toolbar. The previous name of the
method was confusing.
Also, this method inverse the value of the argument (i.e. to display a
NTP-colored background on the toolbar, the value 1 needs to be passed,
instead of 0 before).

Bug: none
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If19d37a8cb1a2f6761e7902b2a828955b73a7e41
Reviewed-on: https://chromium-review.googlesource.com/957093Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542116}