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Use a different path for template URL for yandex search on mobile to avoid an
extra redirection. Mobile should use http://yandex.ru/touchsearch?text=${query}
or http://yandex.ru/padsearch?text=${query} depending on the device form factor
instead of http://yandex.ru/yandsearch?text=${query}.

The issue was reported by yandex and fixed in downstream iOS fork. Upstream
it now that the code is componentized.

TEST=Set your locale to Russian, launch Chrome for iOS, select Yandex as the
search engine, type a query in the omnibox to do a search, check that you're
sent to /touchsearch directly, not via /yandsearch first.

BUG=b/7024148

Review URL: https://codereview.chromium.org/1141743003

Cr-Commit-Position: refs/heads/master@{#330500}