Add a Javascript wrapper around ServiceRegistry and expose it to WebUI.

content/test/data/web_ui_mojo.js

Index: content/test/data/web_ui_mojo.js
diff --git a/content/test/data/web_ui_mojo.js b/content/test/data/web_ui_mojo.js
index 086dc0041252bc901e67f7708a6d92436c7324b8..7289c665c16630a6aa2ed8ed1349ab97eb28b94b 100644
--- a/content/test/data/web_ui_mojo.js
+++ b/content/test/data/web_ui_mojo.js
@@ -5,7 +5,8 @@
 define('main', [
     'mojo/public/js/bindings/connection',
     'content/test/data/web_ui_test_mojo_bindings.mojom',
-], function (connection, bindings) {
+    'content/public/renderer/service_provider',
+], function (connection, bindings, serviceProvider) {
   var retainedConnection;
 
   function RendererTargetTest(bindings) {
@@ -23,8 +24,11 @@ define('main', [
     this.bindings_.pingResponse();
   };
 
-  return function(handle) {
+  return function() {
     retainedConnection = new connection.Connection(
-        handle, RendererTargetTest, bindings.BrowserTargetProxy);
+        // TODO(sammc): Avoid using NAME_ directly.
+        serviceProvider.connectToService(bindings.BrowserTargetProxy.NAME_),
+        RendererTargetTest,
+        bindings.BrowserTargetProxy);
   };
 });