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This fixes an issue that content:// URLs behaves differently from
file:// URLs in tests.

Bug: 1136315
Change-Id: Idf5311ea36c07a739ef6025023675e5a8000cdec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462898Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816448}