Use destination URL to compute search engine type in OmniboxEditModel
Use destination URL to compute search engine type in OmniboxEditModel

This CL switches OmniboxEditModel from using the two-arg variant of
GetEngineType() that takes in the template URL to the one-arg variant that
takes in only the destination URL. The goal is to avoid needing to abstract
usage of UIThreadSearchTermsData for componentization by instead removing that
usage.

Review URL: https://codereview.chromium.org/1269053002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#341711}

ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend