Make sure that Content Handled application can be connected multiple times.

mojo/services/window_manager/window_manager_api_unittest.cc

Index: mojo/services/window_manager/window_manager_api_unittest.cc
diff --git a/mojo/services/window_manager/window_manager_api_unittest.cc b/mojo/services/window_manager/window_manager_api_unittest.cc
index 683be56bbd43d942864c02433a76be8fbdf91907..30ce03873a584e6eaed839de936d34b630f4ebcf 100644
--- a/mojo/services/window_manager/window_manager_api_unittest.cc
+++ b/mojo/services/window_manager/window_manager_api_unittest.cc
@@ -78,10 +78,9 @@ class TestApplicationLoader : public ApplicationLoader,
   // Overridden from ApplicationLoader:
   void Load(ApplicationManager* application_manager,
             const GURL& url,
-            scoped_refptr<LoadCallbacks> callbacks) override {
-    ScopedMessagePipeHandle shell_handle = callbacks->RegisterApplication();
-    if (!shell_handle.is_valid())
-      return;
+            ScopedMessagePipeHandle shell_handle,
+            LoadCallback callback) override {
+    ASSERT_TRUE(shell_handle.is_valid());
     scoped_ptr<ApplicationImpl> app(
         new ApplicationImpl(this, shell_handle.Pass()));
     apps_.push_back(app.release());