Update omnibox dropdown selection/hover background drawing for MD.

chrome/browser/ui/views/omnibox/omnibox_result_view.h

Index: chrome/browser/ui/views/omnibox/omnibox_result_view.h
diff --git a/chrome/browser/ui/views/omnibox/omnibox_result_view.h b/chrome/browser/ui/views/omnibox/omnibox_result_view.h
index 137f547ae213d78209e551cb7d4431fa02a41342..7cbc773498f22bace76a9318c2ca716a0b7cea9d 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_result_view.h
+++ b/chrome/browser/ui/views/omnibox/omnibox_result_view.h
@@ -188,13 +188,6 @@ class OmniboxResultView : public views::View,
                               int text_type,
                               bool is_bold) const;
 
-  // Returns the necessary margin, if any, at the start and end of the view.
-  // This allows us to keep the icon and text in the view aligned with the
-  // location bar contents. For a left-to-right language, StartMargin()
-  // and EndMargin() correspond to the left and right margins, respectively.
-  int StartMargin() const;
-  int EndMargin() const;
-
   static int default_icon_size_;
 
   // This row's model and model index.