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We realized in a conversation around issue 951540 that we don't have settings UI
that allows users to reconsider decisions they've made around external protocol
support. Until we work that out, and make longer-term decisions about the
permission model around the feature generally, we should stop making the problem
worse by removing that checkbox from the UI.

Based on existing telemetry (`BrowserDialogs.ExternalProtocol.HandleState`),
this will affect ~8% of users who interact with the dialog, which itself is a
fairly small group of Chrome's users overall.

Bug: 982341, 987149
Change-Id: I723979aab9606d1c2337a36a8f5a0686b95bb9be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708070
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Kamila Hasanbega <hkamila@google.com>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680353}