Transfer LayerImpl ownership to LayerTreeImpl

cc/trees/layer_tree_host_unittest_scroll.cc

 // Copyright 2012 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.h"
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 588 matching lines @@
                          expected_scroll_layer_->scroll_offset());
         break;
     }
   }
 
   void DidActivateTreeOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* inner_scroll = impl->InnerViewportScrollLayer();
     FakePictureLayerImpl* root_scroll_layer_impl =
         static_cast<FakePictureLayerImpl*>(impl->OuterViewportScrollLayer());
     FakePictureLayerImpl* child_layer_impl = static_cast<FakePictureLayerImpl*>(
-        root_scroll_layer_impl->children()[0].get());
+        root_scroll_layer_impl->children()[0]);
 
     LayerImpl* expected_scroll_layer_impl = NULL;
     LayerImpl* expected_no_scroll_layer_impl = NULL;
     if (scroll_child_layer_) {
       expected_scroll_layer_impl = child_layer_impl;
       expected_no_scroll_layer_impl = root_scroll_layer_impl;
     } else {
       expected_scroll_layer_impl = root_scroll_layer_impl;
       expected_no_scroll_layer_impl = child_layer_impl;
     }
@@ skipping 804 matching lines @@
   RunTest(CompositorMode::THREADED, false);
 }
 
 TEST_F(LayerTreeHostScrollTestLayerStructureChange, ScrollDestroyWholeTree) {
   scroll_destroy_whole_tree_ = true;
   RunTest(CompositorMode::THREADED, false);
 }
 
 }  // namespace
 }  // namespace cc