linux_aura: Fix the insets on LabelButtons.

chrome/browser/ui/views/toolbar/back_button.cc

Index: chrome/browser/ui/views/toolbar/back_button.cc
diff --git a/chrome/browser/ui/views/toolbar/back_button.cc b/chrome/browser/ui/views/toolbar/back_button.cc
index 8186b18dd49a19eb9f0a85c4b8c2ef40859236ae..4b16bb98c41b8dd79e8d5363fb4723d0f9ac13a8 100644
--- a/chrome/browser/ui/views/toolbar/back_button.cc
+++ b/chrome/browser/ui/views/toolbar/back_button.cc
@@ -38,14 +38,16 @@ void BackButton::SetLeadingMargin(int margin) {
   InvalidateLayout();
 }
 
-scoped_ptr<views::Border> BackButton::CreateDefaultBorder() const {
+scoped_ptr<views::LabelButtonBorder> BackButton::CreateDefaultBorder() const {
+  scoped_ptr<views::LabelButtonBorder> border =
+      ToolbarButton::CreateDefaultBorder();
+
   // Adjust border insets to follow the margin change,
   // which will be reflected in where the border is painted
   // through |GetThemePaintRect|.
-  scoped_ptr<views::LabelButtonBorder> border(
-      new views::LabelButtonBorder(style()));
   const gfx::Insets insets(border->GetInsets());
   border->set_insets(gfx::Insets(insets.top(), insets.left() + margin_leading_,
                                  insets.bottom(), insets.right()));
-  return border.PassAs<views::Border>();
+
+  return border.Pass();
 }