Changes in 20210503094544

Built from fc83d69163966376dc2d65dd87f02466ade763ea

..index..
Bug 1698698 R[Core:DOM: Core & HTML]Intermittent dom/tests/mochitest/pointerlock/test_pointerlock_xorigin_iframe.html | Test timed out.
Bug 1708897 R[Core:Layout: Ruby]Remove pref for ruby-position: alternate
Bug 1690025 R[Core:Storage: Quota Manager]Modernize and clean up DirectoryLock
Bug 1707957 R[Core:Widget: Gtk]Add GTK support for simultaneous light / dark system colors.
Bug 1575080 R[Firefox:Site Identity]Inconsistent secure icon on net error pages
Bug 1702376 R[Firefox:Sync]Remove wipeAll support
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Changes to 6 bugs - 5 fixed.