[Merge] lp:~ahayzen/webbrowser-app/dnd-tabs-001 into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

All tests now pass on desktop (both wide and narrow layouts), but the following two tests reliably fail on an arale:

webbrowser_app.tests.test_tabs.TestTabsManagement.test_webview_requests_close
webbrowser_app.tests.test_tabs.TestTabsManagement.test_last_webview_requests_close

It appears the application exists prematurely when closing a webview.
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https://code.launchpad.net/~ahayzen/webbrowser-app/dnd-tabs-001/+merge/308507
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