[Merge] lp:~abreu-alexandre/webbrowser-app/fix-desktop-webapp-install-launch into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

When running on desktop, webapp_container.tests.test_app_launch.WebappContainerAppLaunchTestCase.test_webapps_launch_default_search_path consistently fails.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/fix-desktop-webapp-install-launch/+merge/242707
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