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When the language of the device is changed, the suggestions should be
displayed in the new language.
This CL clears the cached suggestions when the language is changed.

Bug: 765164
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I12894c18531c8d1771d6c7e0d2b6c558ba9ce110
Reviewed-on: https://chromium-review.googlesource.com/737631
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520109}