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During the removal of the VoiceSearch commands, ContentSuggestions was
forgotten. This CL uses the new API to start voice search with the
dispatcher.

Bug: 750636
Change-Id: Ie1cb80f0beb2969868a565c2c60c0df564c10bc8
Reviewed-on: https://chromium-review.googlesource.com/593660Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Jean-François Geyelin <jif@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490759}