Bump GV to 79.0.20200709230528 beta

Fixes #3586
Fixes #3648

Author: bluemarvin

versions.gradle

@@ -25,7 +25,7 @@ def versions = [:]
 // GeckoView versions can be found here:
 // https://maven.mozilla.org/?prefix=maven2/org/mozilla/geckoview/
 versions.gecko_view_nightly = "79.0.20200625094452"
-versions.gecko_view_beta = "79.0.20200630191632"
+versions.gecko_view_beta = "79.0.20200709230528"
 versions.gecko_view_release = "78.0.20200630195452"
 versions.android_components = "44.0.0"
 // Note that android-components also depends on application-services,