views: Remove unused PaintLock API.

ui/views/view.h

Index: ui/views/view.h
diff --git a/ui/views/view.h b/ui/views/view.h
index d6af1bbed1cf65ccf62e393683c37a4068c1b55d..9482cefa86b0b5b57bc7dc12250bbc8602425846 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -1114,7 +1114,6 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   friend class internal::RootView;
   friend class FocusManager;
   friend class Widget;
-  friend class PaintLock;
 
   // Used to track a drag. RootView passes this into
   // ProcessMousePressed/Dragged.
@@ -1238,11 +1237,6 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
 
   // Accelerated painting ------------------------------------------------------
 
-  // Disables painting during time critical operations. Used by PaintLock.
-  // TODO(vollick) Ideally, the widget would not dispatch paints into the
-  // hierarchy during time critical operations and this would not be needed.
-  void set_painting_enabled(bool enabled) { painting_enabled_ = enabled; }
-
   // Creates the layer and related fields for this view.
   void CreateLayer();
 
@@ -1372,9 +1366,6 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   // Whether this view is enabled.
   bool enabled_;
 
-  // Whether this view is painting.
-  bool painting_enabled_;
-
   // When this flag is on, a View receives a mouse-enter and mouse-leave event
   // even if a descendant View is the event-recipient for the real mouse
   // events. When this flag is turned on, and mouse moves from outside of the