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Rename ResourceDispatcherHostBrowserTest to LoaderBrowserTest since these tests aren't specific to RDH.

This is a follow-up to r553717.

Bug: 787614
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Id0fc9c7e8314cfb97ca499b9161471f9850d3f9a
Reviewed-on: https://chromium-review.googlesource.com/1028520
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553796}