cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/trees/tree_synchronizer_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/tree_synchronizer.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 38 matching lines @@
 
 class MockLayer : public Layer {
  public:
   static scoped_refptr<MockLayer> Create(
       std::vector<int>* layer_impl_destruction_list) {
     return make_scoped_refptr(new MockLayer(layer_impl_destruction_list));
   }
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE {
-    return MockLayerImpl::Create(tree_impl, layer_id_).PassAs<LayerImpl>();
+    return MockLayerImpl::Create(tree_impl, layer_id_);
   }
 
   virtual void PushPropertiesTo(LayerImpl* layer_impl) OVERRIDE {
     Layer::PushPropertiesTo(layer_impl);
 
     MockLayerImpl* mock_layer_impl = static_cast<MockLayerImpl*>(layer_impl);
     mock_layer_impl->SetLayerImplDestructionList(layer_impl_destruction_list_);
   }
 
  private:
@@ skipping 681 matching lines @@
                           host_impl->active_tree());
 
   // The clip children should have been unhooked.
   EXPECT_EQ(2u, intervening->children().size());
   EXPECT_FALSE(clip_child2->clip_parent());
   EXPECT_FALSE(additional_clip_child->clip_parent());
 }
 
 }  // namespace
 }  // namespace cc