Fix the absence of padding on some UI buttons.

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 8856e7e8c12f90cb65c58c161f95953a1573ea3b..8a78a96dedebbfa88229cb5d34284fd31393e216 100644
--- a/ui/views/views_delegate.cc
+++ b/ui/views/views_delegate.cc
@@ -152,12 +152,16 @@ gfx::Insets ViewsDelegate::GetBubbleDialogMargins() const {
   return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
 }
 
+int ViewsDelegate::GetButtonMinimumWidth() const {
+  return kMinimumButtonWidth;
+}
+
 int ViewsDelegate::GetDialogButtonMinimumWidth() const {
   return kDialogMinimumButtonWidth;
 }
 
 int ViewsDelegate::GetButtonHorizontalPadding() const {
-  return 0;
+  return kButtonHorizontalPadding;
 }
 
 ViewsDelegate::ViewsDelegate()