NULL -> nullptr under athena/

athena/wm/title_drag_controller.cc

 // Copyright 2014 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.
 
 #include "athena/wm/title_drag_controller.h"
 
 #include "base/bind.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
@@ skipping 41 matching lines @@
                  window,
                  complete)));
   gfx::Transform transform;
   transform.Translate(0, complete ? window->bounds().height() : 0);
   window->SetTransform(transform);
 }
 
 void TitleDragController::OnTransitionEnd(aura::Window* window, bool complete) {
   weak_ptr_.InvalidateWeakPtrs();
   if (!tracker_.Contains(window))
-    window = NULL;
+    window = nullptr;
   shadow_.reset();
   if (window) {
     window->SetTransform(gfx::Transform());
     tracker_.Remove(window);
   }
   if (complete && window && wm::IsActiveWindow(window))
     delegate_->OnTitleDragCompleted(window);
   else
     delegate_->OnTitleDragCanceled(window);
 }
@@ skipping 62 matching lines @@
     EndTransition(
         window,
         swipe_downwards &&
             (distance.y() >= kMinDragDistanceForSwitch ||
              gesture->details().velocity_y() >= kMinDragVelocityForSwitch));
     gesture->SetHandled();
   }
 }
 
 }  // namespace athena