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Loading "file://" on higher versions of android will simply hang instead
of finish in an error, thus causing the test to fail. Presumably on
higher versions with dynamic permissions, browser is waiting for user
consent which is probably not implemented in content shell or tests.

Change it to link to itself instead, which is guaranteed to work.

Bug: 990854
Change-Id: I6501deb0899a4c99f4a917e5ee1fd6ae144cdff3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817100
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699284}