Change Painter factory functions to unique_ptr

ui/views/controls/button/label_button_border.h

Index: ui/views/controls/button/label_button_border.h
diff --git a/ui/views/controls/button/label_button_border.h b/ui/views/controls/button/label_button_border.h
index fabbde5e60e4fde0a3996f93898df23608fbeba0..cdb5dc195d5640fedb59d56848c96ad37a9e1558 100644
--- a/ui/views/controls/button/label_button_border.h
+++ b/ui/views/controls/button/label_button_border.h
@@ -58,7 +58,9 @@ class VIEWS_EXPORT LabelButtonAssetBorder : public LabelButtonBorder {
   // Get or set the painter used for the specified |focused| button |state|.
   // LabelButtonAssetBorder takes and retains ownership of |painter|.
   Painter* GetPainter(bool focused, Button::ButtonState state);
-  void SetPainter(bool focused, Button::ButtonState state, Painter* painter);
+  void SetPainter(bool focused,
+                  Button::ButtonState state,
+                  std::unique_ptr<Painter> painter);
 
  private:
   // The painters used for each unfocused or focused button state.