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This CL adds "cabal", "dat", "did", "dweb", "ethereum", "hyper",
"ipfs", "ipns", "ssb" to the safelist of
navigator.registerProtocolHandler. Chrome status entry is [1]
and feature has been discussed in [2] [3] [4] [5]. Currently,
the WHATWG and WPT changes are pending on the Mozilla position
review [6].

[1] https://www.chromestatus.com/feature/4776602869170176
[2] https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/29sFh4tTdcs/K4XroilVBAAJ
[3] https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/7nHTRUP1EGY
[4] https://github.com/whatwg/html/issues/3935
[5] https://github.com/whatwg/html/issues/3998
[6] https://github.com/mozilla/standards-positions/issues/339

Bug: 651311
Change-Id: Iba45706e985015cf86bd80adef990abd0980a638
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153064Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Cr-Commit-Position: refs/heads/master@{#799626}