mojo: Make InterfacePtr<> testable in if() statements without .get().

mojo/examples/nesting_app/nesting_app.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
 #include "mojo/public/cpp/application/application_connection.h"
@@ skipping 54 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Navigator);
   };
 
   // Overridden from ApplicationImpl:
   virtual bool ConfigureIncomingConnection(ApplicationConnection* connection)
       MOJO_OVERRIDE {
     ViewManager::ConfigureIncomingConnection(connection, this);
     connection->ConnectToService(&window_manager_);
     connection->AddService<Navigator>(this);
     // TODO(davemoore): Is this ok?
-    if (!navigator_.get()) {
+    if (!navigator_) {
       connection->ConnectToApplication(
           kEmbeddedAppURL)->ConnectToService(&navigator_);
     }
     return true;
   }
 
   // Overridden from ViewManagerDelegate:
   virtual void OnRootAdded(ViewManager* view_manager, Node* root) OVERRIDE {
     root->AddObserver(this);
 
@@ skipping 48 matching lines @@
 };
 
 }  // namespace examples
 
 // static
 ApplicationDelegate* ApplicationDelegate::Create() {
   return new examples::NestingApp;
 }
 
 }  // namespace mojo