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Refs (or hashes) are useful for navigating, but not useful for
comparing URLs. We compare URLs when deduping URLs in Omnibox
matches, and when testing eligibility for switching to already
open tabs. This CL changes GURLToStrippedGURL() to remove refs
from the stripped version of destination URLs (only used for
comparison) and when testing URLs for tab switching.

We only remove refs when the input doesn't specify a ref.
This is critical to proper deduping.

Also added unit test.

Bug: 780835
Change-Id: Ifef8d8b9d2efd4394b598342c13ef8aa439089ce
Reviewed-on: https://chromium-review.googlesource.com/1025953
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555760}