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This CL avoids creating the right suggestion placeholder image for non-
rich suggestions (where the image won't be shown).
It also moves the placeholder code to a more appropriate file. (from
OmniboxResultView to OmniboxMatchCellView.

Bug: None
Change-Id: If90e3ad4d4bd45aa80ae1e67a03b7c23437f616e
Reviewed-on: https://chromium-review.googlesource.com/1043220
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556193}