Like Jo said earlier, files under `vendor/assets` are auto-generated by the included Rake tasks, and all the `//= require …` statements are synthesized during that process, so this change should not be made to this actual file but rather the `Rakefile`. I would replace this with something like:

```
diff --git a/Rakefile b/Rakefile
index 9d7aee5..62488f9 100644
--- a/Rakefile
+++ b/Rakefile
@@ -40,10 +40,9 @@ def map_dependencies
 
     deps = build_info['dependencies'].keys
 
-    # jquery.ui.core.js (and only it) should depend on jquery.js itself,
-    # so we remove 'jquery' from the list of dependencies for all files except
-    # jquery.ui.core.js
-    deps.reject! {|d| d == "jquery" } unless source_file_name == 'jquery.ui.core.js'
+    # remove 'jquery' from the list of dependencies for all files, since many
+    # prefer to use jQuery from a CDN (https://github.com/joliss/jquery-ui-rails/pull/30)
+    deps.reject! {|d| d == "jquery" }
 
     deps.map! {|d| source_file_for_dependency_entry d }
 
```