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Normally extensions must specify a concrete list of url patterns. But with this
patch, extensions on the whitelist can do:

 "permissions": ["externally_connectable.all_urls"],
 "externally_connectable": {
    "matches": ["<all_urls>"]
  }

and they will be able to be connected to from any url.

Also add an entry to the whitelist for the CryptoToken extension.

BUG=417062,417494

Review URL: https://codereview.chromium.org/599163003

Cr-Commit-Position: refs/heads/master@{#296799}