Update *ChromeLauncherController* unit tests to use default web apps

Since migrating our default web apps to Chrome apps
(https://chromium-review.googlesource.com/c/chromium/src/+/2586167)
the *ChromeLauncherController* unit tests have been out of date with
the apps they should be checking.

This CL updates them to test with mock default web apps with expected
web app IDs used by default shelf ordering.

Bug: 1058265, 1193383
Change-Id: I5f6c9952577bd5e91e089555566dd623e4e15d07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2793644
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#867966}