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This CL extends the metrics expiry date for
ChromeOS.Apps.ExternalProtocolDialog,
ChromeOS.Apps.ExternalProtocolDialog.Accept, and
ChromeOS.Apps.ExternalProtocolDialog.Rejected.

BUG=1138256

Change-Id: I77d8fe378040c2448ee1d76f94b85a7c4674399b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533217Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827074}