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data URLs are now handled in blink, so we don't need to use
WebURLLoaderImpl for data URL handling in tests. Remove
|default_loader| param from WebURLLoaderMockFactory::CreateURLLoader.

That allows us to expect non-null |resource_dispatcher_| and
|loader_factory_| in WebURLLoaderImpl. Remove the redundant code.

Bug: 751425
Change-Id: Iddcc5178b641c37aa563dce65b0626472d710d02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704717Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684273}