Second try at making MdFocusRing not accept input.

ui/views/controls/button/custom_button.cc

Index: ui/views/controls/button/custom_button.cc
diff --git a/ui/views/controls/button/custom_button.cc b/ui/views/controls/button/custom_button.cc
index 7b4e3fe205c11270a3841fe28b94737b4c8d7038..770f92ff16dcf521f4af1e43de27e957f57d1202 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -47,12 +47,13 @@ class MdFocusRing : public views::View {
   MdFocusRing() {
     SetPaintToLayer(true);
     layer()->SetFillsBoundsOpaquely(false);
-
-    // Don't accept input events.
-    SetEnabled(false);
   }
   ~MdFocusRing() override {}
 
+  bool CanProcessEventsWithinSubtree() const override {
+    return false;
+  }
+
   void OnPaint(gfx::Canvas* canvas) override {
     CustomButton::PaintMdFocusRing(canvas, this);
   }