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If the page was loaded with Most Visited shortcuts, the maximum number
of shortcuts was set to 8. This was not updated if users swapped to
custom links, so an error was thrown.

Do update the maximum number of shortcuts, and remove the error since
we can ignore any shortcuts over the max.

Change-Id: I95e3941ed2c9f2b266075edad7f8a60bddddd93d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793230
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695403}