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This CL also fixes a content_browsertest test case that assumed the
fetch response body would be immediately drained.

Bug: 954442
Change-Id: I22c41758150f427072f18c3ac79a82a1f9678f28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736868Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684083}