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This CL fixes net unittests so that they work if append frame origin
is enabled by default.

Bug: 1026388
Change-Id: Ia307269236e7e58184f4394502eed4e29c0e2246
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930945
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718365}