Update some secondary UI buttons to MD style.

ui/views/controls/button/label_button.h

Index: ui/views/controls/button/label_button.h
diff --git a/ui/views/controls/button/label_button.h b/ui/views/controls/button/label_button.h
index 0e04f5152a80c366849f3defc0758d1f3d5430a1..ceed96d9579f04e40a78af72bc15204d0db52687 100644
--- a/ui/views/controls/button/label_button.h
+++ b/ui/views/controls/button/label_button.h
@@ -112,6 +112,10 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   ImageView* image() const { return image_; }
   Label* label() const { return label_; }
 
+  bool explicitly_set_normal_color() const {
+    return explicitly_set_colors_[STATE_NORMAL];
+  }
+
   // Returns the available area for the label and image. Subclasses can change
   // these bounds if they need room to do manual painting.
   virtual gfx::Rect GetChildAreaBounds();