Transfer LayerImpl ownership to LayerTreeImpl

cc/trees/layer_tree_host_unittest_occlusion.cc

Index: cc/trees/layer_tree_host_unittest_occlusion.cc
diff --git a/cc/trees/layer_tree_host_unittest_occlusion.cc b/cc/trees/layer_tree_host_unittest_occlusion.cc
index 679128a2fb2253e364699f5351e00ba953e7063f..9f35bd90bd390375dae6eae5a1f8a3c270158979 100644
--- a/cc/trees/layer_tree_host_unittest_occlusion.cc
+++ b/cc/trees/layer_tree_host_unittest_occlusion.cc
@@ -49,7 +49,7 @@ class LayerTreeHostOcclusionTestDrawPropertiesOnLayer
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->active_tree()->root_layer();
-    LayerImpl* child = root->children()[0].get();
+    LayerImpl* child = root->children()[0];
 
     // Verify the draw properties are valid.
     EXPECT_TRUE(root->IsDrawnRenderSurfaceLayerListMember());
@@ -102,7 +102,7 @@ class LayerTreeHostOcclusionTestDrawPropertiesOnSurface
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->active_tree()->root_layer();
-    LayerImpl* child = root->children()[0].get();
+    LayerImpl* child = root->children()[0];
     RenderSurfaceImpl* surface = child->render_surface();
 
     // Verify the draw properties are valid.
@@ -165,7 +165,7 @@ class LayerTreeHostOcclusionTestDrawPropertiesOnMask
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->active_tree()->root_layer();
-    LayerImpl* child = root->children()[0].get();
+    LayerImpl* child = root->children()[0];
     RenderSurfaceImpl* surface = child->render_surface();
     LayerImpl* mask = child->mask_layer();
 
@@ -235,7 +235,7 @@ class LayerTreeHostOcclusionTestDrawPropertiesOnScaledMask
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->active_tree()->root_layer();
-    LayerImpl* child = root->children()[0].get();
+    LayerImpl* child = root->children()[0];
     LayerImpl* mask = child->mask_layer();
 
     gfx::Transform scale;
@@ -302,7 +302,7 @@ class LayerTreeHostOcclusionTestDrawPropertiesInsideReplica
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->active_tree()->root_layer();
-    LayerImpl* child = root->children()[0].get();
+    LayerImpl* child = root->children()[0];
     RenderSurfaceImpl* surface = child->render_surface();
     LayerImpl* mask = child->mask_layer();