Update changelog for 64.0.0 release.

Update Geckoview (Beta) to 83.0.20201025174155

Update changelog for 63.0.0 release.

Set version to 60.0.5.

Update GeckoView (Beta) to 82.0.20201008183927.

Set version to 57.0.8.

Update changelog release 62.0.0

Set version to 60.0.3

Import l10n.

Set version to 57.0.7.