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This is called when the AC matches change. The result will be used in
the future to check top result, all results gone (i.e., we can cancel
ongoing prefetches).

Bug: 1138631
Change-Id: I7b6bad212888eac36756f41f2f534233df596b04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493461
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820409}