Transfer LayerImpl ownership to LayerTreeImpl

cc/trees/layer_tree_host_common.h

Index: cc/trees/layer_tree_host_common.h
diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
index c2e7cdcd5ddb3ee1cd8f5df022ec4fa3fa1ce059..85df71f00992d75b7e79a58cf81fc97b646bcda7 100644
--- a/cc/trees/layer_tree_host_common.h
+++ b/cc/trees/layer_tree_host_common.h
@@ -14,7 +14,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
-#include "cc/layers/layer_lists.h"
+#include "cc/layers/layer_collections.h"
 #include "cc/trees/property_tree.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
@@ -145,11 +145,6 @@ class CC_EXPORT LayerTreeHostCommon {
     return layers[index].get();
   }
 
-  static LayerImpl* get_layer_as_raw_ptr(const OwnedLayerImplList& layers,
-                                         size_t index) {
-    return layers[index].get();
-  }
-
   static LayerImpl* get_layer_as_raw_ptr(const LayerImplList& layers,
                                          size_t index) {
     return layers[index];