cc: Change scoped_ptr<T>() to nullptr.

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 309 matching lines @@
     EXPECT_FALSE(host_impl_->CanDraw());
     on_can_draw_state_changed_called_ = false;
 
     // Set up the root layer, which allows us to draw.
     SetupScrollAndContentsLayers(gfx::Size(100, 100));
     EXPECT_TRUE(host_impl_->CanDraw());
     EXPECT_TRUE(on_can_draw_state_changed_called_);
     on_can_draw_state_changed_called_ = false;
 
     // Toggle the root layer to make sure it toggles can_draw
-    host_impl_->active_tree()->SetRootLayer(scoped_ptr<LayerImpl>());
+    host_impl_->active_tree()->SetRootLayer(nullptr);
     EXPECT_FALSE(host_impl_->CanDraw());
     EXPECT_TRUE(on_can_draw_state_changed_called_);
     on_can_draw_state_changed_called_ = false;
 
     SetupScrollAndContentsLayers(gfx::Size(100, 100));
     EXPECT_TRUE(host_impl_->CanDraw());
     EXPECT_TRUE(on_can_draw_state_changed_called_);
     on_can_draw_state_changed_called_ = false;
 
     // Toggle the device viewport size to make sure it toggles can_draw.
@@ skipping 6401 matching lines @@
 
   int invisible_scroll_layer_id = 7;
   scoped_ptr<LayerImpl> invisible_scroll =
       CreateScrollableLayer(invisible_scroll_layer_id, content_size, root);
   invisible_scroll->SetDrawsContent(false);
 
   int container_id = 8;
   scoped_ptr<LayerImpl> container =
       LayerImpl::Create(host_impl_->active_tree(), container_id);
 
-  scoped_ptr<std::set<LayerImpl*> > scroll_children(new std::set<LayerImpl*>());
+  scoped_ptr<std::set<LayerImpl*>> scroll_children(new std::set<LayerImpl*>);
   scroll_children->insert(scroll_child.get());
   invisible_scroll->SetScrollChildren(scroll_children.release());
 
   scroll_child->SetScrollParent(invisible_scroll.get());
 
   container->AddChild(invisible_scroll.Pass());
   container->AddChild(scroll_child.Pass());
 
   scroll_layer->AddChild(container.Pass());
 
@@ skipping 753 matching lines @@
   // surface.
   EXPECT_EQ(0, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_EQ(1, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_LE(1, num_lost_surfaces_);
 }
 
 }  // namespace
 }  // namespace cc