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[Omnibox] Avoid removing the `www.` prefix during deduping when doing so would leave no host component.

When sorting and deduping matches, match GURLs are stripped (`AutocompleteMatch::GURLToStrippedGURL`). Certain omnibox inputs, such as `http://www.` without inline autocomplete, produce matches with host compoments `www.`. Stripping `www.` in these cases would result in an empty url host component and, therefore, invalid `GURL`. Invoking `GURL::spec` on such invalid URLs would then cause a DCHECK to evaluate false and crash the browser. The crash only affects debug builds as the DCHECK is inactive for non-debug builds.

Bug: 898554
Change-Id: I73461c65ba53891d6f3b52bc767c754b02c1ce3e
Reviewed-on: https://chromium-review.googlesource.com/c/1331631
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607709}