GitLab

Change PrintObserver to a WebStateUserData and move creation to
BrowserViewController to remove the need to create it from Tab
and a dependency of model on UI.

Introduce a separate protocol WebStatePrinter implemented by
BrowserViewController to decouple PrintTabHelper from UI.

Bug: 760556
Change-Id: I42ea68e70e84b52ed7c5f705ee01e74e749e09df
Reviewed-on: https://chromium-review.googlesource.com/660122
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501257}