Make search icon in omnibox results hidpi

chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm
index 95bc264ffb79048825c1073e15b52b14cab2edc8..3b25366b6b3b75656f3cc092f82526722a92cd52 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.mm
@@ -399,9 +399,9 @@ void OmniboxPopupViewMac::PositionPopup(const CGFloat matrixHeight) {
 }
 
 NSImage* OmniboxPopupViewMac::ImageForMatch(const AutocompleteMatch& match) {
-  const SkBitmap* bitmap = model_->GetIconIfExtensionMatch(match);
-  if (bitmap)
-    return gfx::SkBitmapToNSImage(*bitmap);
+  gfx::Image image = model_->GetIconIfExtensionMatch(match);
+  if (!image.IsEmpty())
+    return image.AsNSImage();
 
   const int resource_id = match.starred ?
       IDR_OMNIBOX_STAR : AutocompleteMatch::TypeToIcon(match.type);