Revert of Delete pre-MD code from OmniboxResultView (patchset #9 id:160001 of https://codereview.chromium.org/2365263006/ )

Reason for revert:
The downstream Chrome on iOS code has never been ported to the new vector icon and still use MD raster icon. This CL breaks Chrome on iOS downstream (due to missing resources and removal of GetIcon() method).

Original issue's description:
> Delete pre-MD code from OmniboxResultView
>
> BUG=648281
>
> Committed: https://crrev.com/255d6d6d2bbc0e8715ad0985d239897f80a4b707
> Cr-Commit-Position: refs/heads/master@{#423690}

TBR=pkasting@chromium.org,blundell@chromium.org,sky@chromium.org,estade@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=648281

Review-Url: https://codereview.chromium.org/2399333002
Cr-Commit-Position: refs/heads/master@{#423819}