omnibox: decrease bottom inset of omnibox results frame for material design refresh by 1

Previously, the insets were 5 vertically and 6 horizontally. Now, the bottom inset has been decreased to 4 in order to align the bottom of the results frame's top section with the bottom of the location bar

Bug: 852994
Change-Id: If3a7d85c3edc3a8d055ff53d910c688ced9171ec
Reviewed-on: https://chromium-review.googlesource.com/1102661Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567736}

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

@@ -93,7 +93,7 @@ int RoundedOmniboxResultsFrame::GetNonResultSectionHeight() {
 
 // static
 gfx::Insets RoundedOmniboxResultsFrame::GetLocationBarAlignmentInsets() {
-  return ui::MaterialDesignController::IsRefreshUi() ? gfx::Insets(5, 6)
+  return ui::MaterialDesignController::IsRefreshUi() ? gfx::Insets(5, 6, 4, 6)
                                                      : gfx::Insets(4);
 }