[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr in src/…

cc/layers/scrollbar_layer_impl_base.h

 // Copyright 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 CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
 #define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
 
 namespace cc {
 
 class LayerTreeImpl;
 
 class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
  public:
   int ScrollLayerId() const {
     return scroll_layer_ ? scroll_layer_->id() : Layer::INVALID_ID;
   }
   int ClipLayerId() const {
     return clip_layer_ ? clip_layer_->id() : Layer::INVALID_ID;
   }
 
   void SetScrollLayerAndClipLayerByIds(int scroll_layer_id, int clip_layer_id);
-  void ClearScrollLayer() { scroll_layer_ = NULL; }
-  void ClearClipLayer() { clip_layer_ = NULL; }
+  void ClearScrollLayer() { scroll_layer_ = nullptr; }
+  void ClearClipLayer() { clip_layer_ = nullptr; }
 
   float current_pos() const { return current_pos_; }
   bool SetCurrentPos(float current_pos);
   int maximum() const { return maximum_; }
   bool SetMaximum(int maximum);
 
   bool SetVerticalAdjust(float vertical_adjust);
 
   bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
   void set_is_overlay_scrollbar(bool is_overlay) {
@@ skipping 58 matching lines @@
   float vertical_adjust_;
 
   float visible_to_total_length_ratio_;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_