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When the WebUIOmniboxPopup flag is on, this CL doesn't add the native
result views.

This CL is just meant to "hollow out" the OmniboxPopupContentsView
when the flag is on. The next step would be add an actual
views::WebView to take the place of all the child result views.

This CL was deliberately kept to just a bunch of stubs to illustrate
all the integration points we would need with a WebUI popup.

Even when the flag is on, we keep the actual OmniboxPopupContentsView,
because it's responsible for drawing the "beard" and transparent
poke-through that we need even if we render the popup contents in
WebUI.

Bug: 1046561
Change-Id: I01d7a77413b760a290dc823b2a142921121f81cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042218Reviewed-by: manuk hovanesian <manukh@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739131}