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CreateLoaderAndStart used in TryCreateDuplicateRequestIds created
network::mojom::URLLoaderPtr and network::TestURLLoaderClient in it and
hence the request got aborted. That will lead to flakiness because on
a slow system the first request got aborted before the second request
arrives. This CL fixes that.

Bug: 799516
Change-Id: I4767d7f98185e633f229315074a9361b14e47e3b
Reviewed-on: https://chromium-review.googlesource.com/1125581Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572517}