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I broke match deletion in the presence of caching REMOTE_NO_URL here:
https://chromium-review.googlesource.com/c/chromium/src/+/2430227/9/components/omnibox/browser/zero_suggest_provider.cc

This CL fixes it by aggressively clearing the cache any time a
ZeroSuggest match is deleted, regardless of the request type.

I think this CL will fix the bug and it's harmless to "overaggressively"
clear the cache. Match deletions are rare, and it's just a cache.

Bug: 1136609
Change-Id: Ia8c39975bc68e0c33dccf9c08c630935e29abb2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462342Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815391}