test renaming overhaul: step 4 client tests

client/tests/client/dom/PerformanceApiTest.dart

-#library('PerformanceApiTest');
-#import('../../../../lib/unittest/unittest.dart');
-#import('../../../../lib/unittest/dom_config.dart');
-#import('dart:dom');
-
-main() {
-  useDomConfiguration();
-  test('PerformanceApi', () {
-    // Check that code below will not throw exceptions.
-    var requestStart = window.performance.timing.requestStart;
-    var responseStart = window.performance.timing.responseStart;
-    var responseEnd = window.performance.timing.responseEnd;
-    
-    var loading = window.performance.timing.domLoading;
-    var loadedStart = window.performance.timing.domContentLoadedEventStart;
-    var loadedEnd = window.performance.timing.domContentLoadedEventEnd;
-    var complete = window.performance.timing.domComplete;
-
-    var loadEventStart = window.performance.timing.loadEventStart;
-  });
-}