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The SearchProvider may mark some suggestions to be prefetched based on
instructions from the suggest server. Currently we prefetch it only if such a
match ranks sufficiently highly. This cl allows to prefetch the suggestion
regardless of its autocomplete rank if allow_prefetch_non_default_match field
trial is enabled.

BUG=386203

Review URL: https://codereview.chromium.org/324273004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278668 0039d316-1c4b-4281-b951-d872f2087c98