upgrade to rails3, but grip is broken

test/performance/browsing_test.rb

@@ -1,5 +1,5 @@
 require 'test_helper'
-require 'performance_test_help'
+require 'rails/performance_test_help'
 
 # Profiling results for each test method are written to tmp/performance.
 class BrowsingTest < ActionController::PerformanceTest