[Mac][Material Design] Update Omnibox dropdown on Mac to MD

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index 18c595cf53935e625b12390441fd2215fe4a9dca..eb64a73eece6b39a711c4a88e673e4a768ca7c1a 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -615,16 +615,15 @@ void LocationBarViewMac::OnThemeChanged() {
 }
 
 void LocationBarViewMac::OnChanged() {
-  NSImage* image = nil;
-  if (ui::MaterialDesignController::IsModeMaterial()) {
-    UpdateLocationIcon();
-  } else {
+  if (!ui::MaterialDesignController::IsModeMaterial()) {
     const int resource_id = omnibox_view_->GetIcon();
-    image = OmniboxViewMac::ImageForResource(resource_id);
+    NSImage* image = OmniboxViewMac::ImageForResource(resource_id);
     location_icon_decoration_->SetImage(image);
     ev_bubble_decoration_->SetImage(image);
     Layout();
+    return;
   }
+  UpdateLocationIcon();
 }
 
 void LocationBarViewMac::OnSetFocus() {