Remove a comment referring to the Crypto runtime feature.
Remove a comment referring to the Crypto runtime feature.

The comment is no longer relevant since the Crypto runtime feature was removed in r184996.

BUG=402536

Review URL: https://codereview.chromium.org/1015363002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192187 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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