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Since protocols can only be added via script, this behavior can't occur
during NoStatePrefetch. Using the inherited functionality is also safe,
since it is a no-op.

Bug: 1038068
Change-Id: Ie633f94580ae5618fe42b7b017592d3a284071e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2158407
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761146}