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Previously we were timing out 'null' favicon results after 60 seconds.

This has turned out to be too simple of a heuristic now that we are
using the FaviconCache to back the default search provider icon in the
location bar.

Users would expect that the favicon appear immediately after loading a
matching search results page, and would be confused by a 60 second
delay.

Bug: 88243, 823535
Change-Id: I062361ffad0e0bdaa45f44ad67a7071efa086f2c
Reviewed-on: https://chromium-review.googlesource.com/1055787
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558816}