Linux Aura: Use appropriate button style depending on aura/gtk NativeTheme

chrome/browser/ui/libgtk2ui/gtk2_border.h

Index: chrome/browser/ui/libgtk2ui/gtk2_border.h
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_border.h b/chrome/browser/ui/libgtk2ui/gtk2_border.h
index c201f466357d329ea06b529d616ffc49d7788667..c43a4e4ed1453bfdd9b81de541df5308263921bd 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_border.h
+++ b/chrome/browser/ui/libgtk2ui/gtk2_border.h
@@ -28,8 +28,7 @@ class Gtk2Border : public views::Border,
                    public views::NativeThemeChangeObserver {
  public:
   Gtk2Border(Gtk2UI* gtk2_ui,
-             views::LabelButton* owning_button,
-             scoped_ptr<views::Border> border);
+             views::LabelButton* owning_button);
   virtual ~Gtk2Border();
 
   // Overridden from views::Border:
@@ -56,11 +55,6 @@ class Gtk2Border : public views::Border,
   // force invalidate the layout on theme changes.
   views::LabelButton* owning_button_;
 
-  // Since we don't want to expose the concept of whether we're using a GTK
-  // theme down to the cross platform views layer, we keep a normal Border and
-  // delegate to it whenever we aren't in GTK theme mode.
-  scoped_ptr<views::Border> border_;
-
   DISALLOW_COPY_AND_ASSIGN(Gtk2Border);
 };