Refactor SpecialPopupRow out of tray_views.h/cc into its own files.

ash/system/tray/special_popup_row.h

Index: ash/system/tray/special_popup_row.h
diff --git a/ash/system/tray/special_popup_row.h b/ash/system/tray/special_popup_row.h
new file mode 100644
index 0000000000000000000000000000000000000000..32821f57d7f90ed54fae6878e78beb2531fa06e9
--- /dev/null
+++ b/ash/system/tray/special_popup_row.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ASH_SYSTEM_TRAY_SPECIAL_POPUP_ROW_H_
+#define ASH_SYSTEM_TRAY_SPECIAL_POPUP_ROW_H_
+
+#include "ui/gfx/size.h"
+#include "ui/views/view.h"
+
+namespace views {
+class Label;
+}
+
+namespace ash {
+namespace internal {
+
+class ThrobberView;
+class TrayItemView;
+class TrayPopupHeaderButton;
+class ViewClickListener;
+
+// The 'special' looking row in the uber-tray popups. This is usually the bottom
+// row in the popups, and has a fixed height.
+class SpecialPopupRow : public views::View {
+ public:
+  SpecialPopupRow();
+  virtual ~SpecialPopupRow();
+
+  void SetTextLabel(int string_id, ViewClickListener* listener);
+  void SetContent(views::View* view);
+
+  void AddButton(TrayPopupHeaderButton* button);
+  void AddThrobber(ThrobberView* throbber);
+
+  views::View* content() const { return content_; }
+
+ private:
+  // Overridden from views::View.
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+
+  views::View* content_;
+  views::View* button_container_;
+  views::Label* text_label_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpecialPopupRow);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_SPECIAL_POPUP_ROW_H_