GitLab

Refactors the AppUrlLoadingService to get a Browser from its delegate
and not care about TabModel. There should be no functional changes.

Also :
 - Updates TestAppUrlLoadingService to use correct variable naming.

Bug: 1046373
Change-Id: I1da8a1033b0bf26972f07908bbe815c6b9d8f4c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094308
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748683}