Displays the app title instead of page title when off scope.

Previously, we would always display the current page's title in the
window title. This updates the logic so we display the app name when
off scope (the page title will be displayed in the custom tab bar).


Bug: 853593
Change-Id: Id24d3104386a5334c331599480f0b1ce269ba9e1
Reviewed-on: https://chromium-review.googlesource.com/c/1319214
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606736}
2 files changed