Omnibox/Views: Fix cutout position while the omnibox popup is open in touch.

The rounded omnibox drop-down cuts out a hole for the omnibox to show through
when it's open to avoid having to teleport the LocationBarView between Widgets.
r550927 adjusted the positioning and size of the drop-down, but regressed by
positioning the cutout incorrectly. This patch re-aligns it.

Bug: 833281
Change-Id: If95dad702b54fa44e6e8e6df4b959401510993df
Reviewed-on: https://chromium-review.googlesource.com/1013020Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551198}

chrome/browser/ui/views/omnibox/rounded_omnibox_results_frame.cc

@@ -107,8 +107,7 @@ void RoundedOmniboxResultsFrame::Layout() {
 
   gfx::Rect top_bounds(bounds);
   top_bounds.set_height(GetNonResultSectionHeight());
-  // Height is already accounted for in GetNonResultSectionHeight();
-  top_bounds.set_width(bounds.width() - kLocationBarAlignmentInsets.width());
+  top_bounds.Inset(kLocationBarAlignmentInsets);
   top_background_->SetBoundsRect(top_bounds);
 
   gfx::Rect results_bounds(bounds);