🦁Move omnibox icon files back to popup directory

This also undoes many of the moves from 1609915. It turned out that
omnibox_icon_view should not be reused in the actual omnibox, so those
files didn't need to be shared.

Bug: 1622171
Change-Id: I1cb821e66f0f56f2008ca796912de12297386902
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622845
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662141}
13 files changed