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This combines the origin and URL checks to remove some duplicate and
unnecessary checks. This will also make it easier to update the URL
checks to handle non-standard URLs in a follow-up CL.

- Inlines CanCommitURL() at the beginning and end of CanCommitOrigin()
  and removes redundant checks.
- Rename CanCommitOrigin() to CanCommitOriginAndUrl()
- Move kDisableWebSecurity check to the top of the function so it
  skips URL checks as well. This is the only functional change.

Bug: 991607
Change-Id: Id8b9f52b594994c1a4c1c38a709ba3e4c0daffc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742836
Commit-Queue: Aaron Colwell <acolwell@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685408}