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Adds a message and an icon to the first run Welcome to Chrome page
when the browser is managed by enterprise. The browser is considered
managed if there is some policy data in the
-com.apple.configuration.managed key of the NSUserDefaults.

Bug: 1155745
Change-Id: Ice85f780c5508376d7ad1cacdddcd7927b8c97fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580699Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Javier Flores <javierrobles@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#837182}