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We no longer use process-per-site for WebUI (see crbug.com/982266), so
fix a couple of comments that implied that we do.

Bug: 1015882, 982266
Change-Id: I639c5b0b159c5e88f15263fdab01dc2dec95b33b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151681Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760289}