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This is a reland of ffc8179c8a7bca7404f1f9463331c9a8f54b69a5.
The original CL was reverted due to an infra issue.

Original change's description:
> Inline ResourceDispatcherHostImpl::CreateBaseResourceHandler
>
> Now it always creates a MojoAsyncResourceHandler, so there is no need to
> have a separate function.
>
> Bug: None
> Change-Id: Iafadf07f8dd5930d8de600ed87c0d2aa62a91038
> Reviewed-on: https://chromium-review.googlesource.com/1169034
> Reviewed-by: Charlie Harrison <csharrison@chromium.org>

Bug: None
Change-Id: If915cdf70ae06088b7eea366972472d22b71c28e
Tbr: csharrison@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1173591Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582805}