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Any change to DSE should cause the search prefetch cache to be cleared.
While it is only necessary to clean up when url or search post params
change, it is healthier to clean up whenever DSE changes state.

Bug: 1138647
Change-Id: I6f995b5423464decd823a33b9c71262cf3999c7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515365
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826979}