Made the bookmarks extension APIs aware of managed bookmarks.

chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc

Index: chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc
diff --git a/chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc b/chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc
index 182cbb4a9844617f47dad2b678a27efb88b24ba0..c11907a5f54be5c119915e433816873f0d3f88b6 100644
--- a/chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc
+++ b/chrome/browser/extensions/api/bookmarks/bookmark_api_helpers.cc
@@ -110,6 +110,10 @@ bool RemoveNode(BookmarkModel* model,
     *error = keys::kModifySpecialError;
     return false;
   }
+  if (model->IsManaged(node)) {
+    *error = keys::kModifyManagedError;
+    return false;
+  }
   if (node->is_folder() && !node->empty() && !recursive) {
     *error = keys::kFolderNotEmptyError;
     return false;