Use an InsetMetric instead of a constant for vector button padding.

ui/views/views_delegate.cc

Index: ui/views/views_delegate.cc
diff --git a/ui/views/views_delegate.cc b/ui/views/views_delegate.cc
index a14cf4882998ba300f4f8e1d42605e57716af110..9dcebc2896720e19a3bd968bd36ed1ba46e8e17f 100644
--- a/ui/views/views_delegate.cc
+++ b/ui/views/views_delegate.cc
@@ -136,6 +136,8 @@ gfx::Insets ViewsDelegate::GetInsetsMetric(InsetsMetric metric) const {
                          kButtonHEdgeMarginNew);
     case InsetsMetric::BUBBLE_DIALOG:
       return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
+    case InsetsMetric::VECTOR_IMAGE_BUTTON_PADDING:
+      return gfx::Insets(kVectorButtonExtraTouchSize);
   }
   NOTREACHED();
   return gfx::Insets();