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Since the clear button is in omnibox, it makes sense for it to be
directly configured in the omnibox layer, without going to the location
bar.

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I51be645345550517e120939416a7e0664b74cf87
Reviewed-on: https://chromium-review.googlesource.com/924424
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537857}