GitLab

This makes it easier to find and consistent with ChromeShellDelegate.

Also cleanup unnecessary includes in ChromeShellDelegate.

I'm doing this because I may need to add a method to the delegate.

Bug: none
Test: existing browser_tests, manually test magnifier
Change-Id: Icf0fdda4f6bea0f9fc3c281902e87fc036764950
Reviewed-on: https://chromium-review.googlesource.com/1246661Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594487}