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Remove the permission warning for externally connectable sites. This
warning previously indicated that an extension could "Communicate with
cooperating websites", and was shown when an extension specified
"externally_connectable" in the manifest with any "matches" (i.e.,
websites). This allowed websites to message extensions via
runtime.sendMessage() and runtime.connect().

This wasn't very useful. Any extension can communicate with cooperating
websites without this capability, e.g. by being specified in the
cooperating sites' ACAO, and just making an ordinary CORS request. This
requires no permissions, because it is a normal web capability. (There
are also other ways extensions can communicate, e.g. through
web_accessible_resources).

Remove the warning.

Bug: 469602
Change-Id: I8663125f268b4e031a0a83c4dd0fd886cc2a6457
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148249Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759893}