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..20b782cc4d247d246efaa0077cd34cc3d5c2ce0d 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,
+            ScopedMessagePipeHandle shell_handle,
             scoped_refptr<LoadCallbacks> callbacks) override {
-    ScopedMessagePipeHandle shell_handle = callbacks->RegisterApplication();
-    if (!shell_handle.is_valid())
-      return;
+    ASSERT_TRUE(shell_handle.is_valid());
     scoped_ptr<ApplicationImpl> app(
         new ApplicationImpl(this, shell_handle.Pass()));
     apps_.push_back(app.release());