Fixes #620 - Clears everything WKWebView creates (#626)
Fixes #620 - Clears everything WKWebView creates (#626)


mozilla-mobile/focus-ios,justindarc/focus,mozilla-mobile/focus-ios,mozilla-mobile/focus,justindarc/focus,mozilla-mobile/focus,justindarc/focus,mozilla-mobile/focus,mozilla/focus,mozilla/focus,mozilla-mobile/focus,mozilla/focus,mozilla-mobile/focus-ios,mozilla/focus,mozilla-mobile/focus,mozilla/focus,mozilla-mobile/focus-ios,mozilla-mobile/focus-ios,justindarc/focus,justindarc/focus,mozilla-mobile/focus,mozilla-mobile/focus-ios,justindarc/focus