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WebAppInstallManager::InstallBookmarkAppFromSync will be a special
method to support online compatibility with bookmark apps.

Let's use InstallWebAppsAfterSync to test:
1) TwoConcurrentInstallsAreRunInOrder
2) InstallManagerDestroyed
cases. These tests are not about InstallBookmarkAppFromSync directly,
they test internal WebAppInstallManager queue of tasks and a lifetime.
That's why it's okay to change them.

As a result, all WebAppInstallManager unit tests pass even if
kDesktopPWAsWithoutExtensions is enabled by default.

Note: web_app_install_manager_unittest.cc works as if
kDesktopPWAsWithoutExtensions is enabled: it has a BMO registry in
its test fixture.

Bug: 1020037
Change-Id: I4b0d008e023ee2d60cf56aad9cc0270bb17f747d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094921
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749547}