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This CL removes all contextual search code from the BVC. Almost all of
the logic contained in the BVC is ported to a new wrangler class.

Any object wishing to use contextual search (without further refactoring)
will need to furnish a provider object as defined in the wrangler class
header, which at this stage just encapsulates all of the interfaces into
the BVC that the contextual search code used to use.

Bug: 
Change-Id: I23ffe787b26ead87c9c50e4730851f6b992c95a4
Reviewed-on: https://chromium-review.googlesource.com/574534
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487435}