Implement automatic load of composed/embedded automation trees

chrome/common/extensions/api/automation.idl

Index: chrome/common/extensions/api/automation.idl
diff --git a/chrome/common/extensions/api/automation.idl b/chrome/common/extensions/api/automation.idl
index 2c48253a86f695ee4cf2d8bf473f5cb6924041dc..8a880e7c4c790b7ce99283445ac85e10a8aa07a7 100644
--- a/chrome/common/extensions/api/automation.idl
+++ b/chrome/common/extensions/api/automation.idl
@@ -313,9 +313,6 @@
   //
   // Extends $(ref:automation.AutomationNode).
   [nocompile, noinline_doc] dictionary AutomationRootNode {
-    // TODO(aboxhall/dtseng): implement loading. Kept separate to not include
-    // in generated docs.
-
     // Whether this AutomationRootNode is loaded or not. If false, call load()
     // to get the contents.
     boolean loaded;