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This change addresses the case where a native URL is presented
with a clear omnibox text on mobile devices, eg.
- chrome://history or
- chrome://bookmarks
and ensures that no suggestion is offered when the text is cleared.

The default match is produced by AutocompleteProviderClient, which
does not use the current URL, but instead the text presented in the
omnibox, and with the Omnibox text being empty, the default match
carries no URL.

Bug: 1125046
Change-Id: I56c11def20ed79a9852a578bbf75dd6578d4e26d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401331
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805538}