[DevTools] Network.emulateNetworkConditions now affects NetworkStateNotifier.

third_party/WebKit/LayoutTests/media/video-preload-cellular-test.js

 function cellular_preload_test() {
   async_test(function(t) {
-    internals.setNetworkStateNotifierTestOnly(true);
-    internals.setNetworkConnectionInfo('cellular3g', 2.0);
+    internals.setNetworkConnectionInfoOverride(true, 'cellular3g', 2.0);
 
     var video = document.querySelector('video');
     assert_equals(video.preload, 'none')
     video.src = 'resources/test-positive-start-time.webm';
 
     video.onsuspend = t.step_func_done();
     video.onprogress = t.unreached_func();
     t.add_cleanup(function() {
-      internals.setNetworkStateNotifierTestOnly(false);
+      internals.clearNetworkConnectionInfoOverride();
     });
   });
 }