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Test helper functions are introduced in
web_app_browsertest_util.h

BookmarkAppTest is renamed to WebAppEngagementBrowserTest.

The test no longer references extensions.

TBR=calamity@chromium.org

Bug: 966290
Change-Id: I630fa2873766a5a2955fe96f91008fd3bb9bc84e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787761Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698408}