Get rid of KeepAlive. Quit shell when all urls run directly by Context are closed.

mojo/shell/shell_test_base.h

Index: mojo/shell/shell_test_base.h
diff --git a/mojo/shell/shell_test_base.h b/mojo/shell/shell_test_base.h
index 7c61844431c5a9d9fc1ca658d790f56d2d462bbc..f28cc6ec8a99f5c337625476b47eee224c6f4f74 100644
--- a/mojo/shell/shell_test_base.h
+++ b/mojo/shell/shell_test_base.h
@@ -39,9 +39,11 @@ class ShellTestBase : public testing::Test {
       const GURL& application_url,
       const std::string& service_name);
 
-  ScopedMessagePipeHandle ConnectToServiceViaNetwork(
-      const GURL& application_url,
-      const std::string& service_name);
+  template <typename Interface>
+  void ConnectToService(const GURL& application_url,
+                        InterfacePtr<Interface>* ptr) {
+    ptr->Bind(ConnectToService(application_url, Interface::Name_).Pass());
+  }
 
   base::MessageLoop* message_loop() { return &message_loop_; }
   Context* shell_context() { return &shell_context_; }