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There are jsut a handfull of tests which use it, and we only
dump wilLSendRequest anyway. All the tests do not gain any
meaningful results from it, while prefetch.html is completely
covered by prefetch-onload.html

Bug: none
Change-Id: I3cf80bee411fa94672f0585c7e38cdcad5806fad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831466
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701344}