GitLab

Introduce a new tab helper AutofillTabHelper that owns AutofillController
and forward access to the public API of AutofillController and change all
code to use the AutofillTabHelper instead of accessing it via Tab.

Bug: 760556
Change-Id: Ic986c22f60f016658258c6f7b6591633ded167ac
Reviewed-on: https://chromium-review.googlesource.com/647588
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: mahmadi (Moe) <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499975}