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This CL makes vector icon selection for AutocompleteMatch instances more
direct and simple by moving some of the complexity out of a static
method that was increasingly requiring callers to examine fields of the
instance to compose the call.  By empowering instances to use available
state for icon selection, it is now easy to specialize.  This was done
first for Drive document icons, and will also be used to differentiate
Pedals.  This CL only specializes one using an omnibox icon but all
Pedals will get their own.

Bug: 893183
Change-Id: I460c6202f1220b18091a9178f471464943190072
Reviewed-on: https://chromium-review.googlesource.com/c/1329895
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608144}