Kathleen Brade authored Feb 08, 2017 and Georg Koppen committed Apr 04, 2017

Ignore "not available" errors from appCacheStorage.asyncEvictStorage()
since these can occur if the cache has not been used yet.

Change torbutton_close_tabs_on_new_identity() to use browser.removeTab()
instead of browser.contentWindow.close() since we cannot directly access
the contentWindow when multi-process mode is enabled.

Fix indentation and modernize the torbutton_close_tabs_on_new_identity()
code.