Transfer LayerImpl ownership to LayerTreeImpl

cc/trees/layer_tree_impl_unittest.cc

Index: cc/trees/layer_tree_impl_unittest.cc
diff --git a/cc/trees/layer_tree_impl_unittest.cc b/cc/trees/layer_tree_impl_unittest.cc
index 195c44b19a511d6bf068212d98359df9cca7ba96..4a5f48082e874b8dc6d3c95ef447e994d3fe6947 100644
--- a/cc/trees/layer_tree_impl_unittest.cc
+++ b/cc/trees/layer_tree_impl_unittest.cc
@@ -883,9 +883,9 @@ TEST_F(LayerTreeImplTest, HitTestingForMultipleLayers) {
     ExecuteCalculateDrawProperties(root.get());
   }
 
-  LayerImpl* child1 = root->children()[0].get();
-  LayerImpl* child2 = root->children()[1].get();
-  LayerImpl* grand_child1 = child1->children()[0].get();
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
 
   host_impl().SetViewportSize(root->bounds());
   host_impl().active_tree()->SetRootLayer(std::move(root));
@@ -1111,9 +1111,9 @@ TEST_F(LayerTreeImplTest, HitTestingForMultipleLayersAtVaryingDepths) {
     root->AddChild(std::move(child2));
   }
 
-  LayerImpl* child1 = root->children()[0].get();
-  LayerImpl* child2 = root->children()[1].get();
-  LayerImpl* grand_child1 = child1->children()[0].get();
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
 
   host_impl().SetViewportSize(root->bounds());
   host_impl().active_tree()->SetRootLayer(std::move(root));
@@ -1348,9 +1348,9 @@ TEST_F(LayerTreeImplTest, HitTestingForMultipleLayerLists) {
     ExecuteCalculateDrawProperties(root.get());
   }
 
-  LayerImpl* child1 = root->children()[0].get();
-  LayerImpl* child2 = root->children()[1].get();
-  LayerImpl* grand_child1 = child1->children()[0].get();
+  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child2 = root->children()[1];
+  LayerImpl* grand_child1 = child1->children()[0];
 
   host_impl().SetViewportSize(root->bounds());
   host_impl().active_tree()->SetRootLayer(std::move(root));
@@ -1692,7 +1692,7 @@ TEST_F(LayerTreeImplTest,
   // The visible content rect for test_layer is actually 100x100, even though
   // its layout size is 50x50, positioned at 25x25.
   LayerImpl* test_layer =
-      host_impl().active_tree()->root_layer()->children()[0].get();
+      host_impl().active_tree()->root_layer()->children()[0];
   ASSERT_EQ(1u, RenderSurfaceLayerList().size());
   ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
 
@@ -1984,7 +1984,7 @@ TEST_F(LayerTreeImplTest, HitTestingTouchHandlerRegionsForLayerThatIsNotDrawn) {
   host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
 
   LayerImpl* test_layer =
-      host_impl().active_tree()->root_layer()->children()[0].get();
+      host_impl().active_tree()->root_layer()->children()[0];
   // As test_layer doesn't draw content, the layer list of root's render surface
   // should contain only the root layer.
   ASSERT_EQ(1u, RenderSurfaceLayerList().size());
@@ -2015,7 +2015,7 @@ TEST_F(LayerTreeImplTest, HitTestingTouchHandlerRegionsForLayerThatIsNotDrawn) {
 
   // We change the position of the test layer such that the test point is now
   // inside the test_layer.
-  test_layer = host_impl().active_tree()->root_layer()->children()[0].get();
+  test_layer = host_impl().active_tree()->root_layer()->children()[0];
   test_layer->SetPosition(gfx::PointF(10.f, 10.f));
   test_layer->NoteLayerPropertyChanged();
   expected_screen_space_transform.MakeIdentity();