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

mojo/examples/window_manager/window_manager.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 "mojo/examples/keyboard/keyboard.mojom.h"
 #include "mojo/examples/window_manager/debug_panel.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
 #include "mojo/public/cpp/application/application_connection.h"
@@ skipping 446 matching lines @@
     embedded->SetBounds(bounds);
     Embed(embedded, url, nav_details.Pass(), response.Pass());
     embedded->SetFocus();
     return embedded;
   }
 
   void Embed(Node* node, const std::string& app_url,
              navigation::NavigationDetailsPtr nav_details,
              navigation::ResponseDetailsPtr response) {
     node->Embed(app_url);
-    if (nav_details.get()) {
+    if (nav_details) {
       navigation::NavigatorPtr navigator;
       app_->ConnectToService(app_url, &navigator);
       navigator->Navigate(node->id(), nav_details.Pass(), response.Pass());
     }
   }
 
   bool IsDescendantOfKeyboard(View* target) {
     return keyboard_manager_.get() &&
         keyboard_manager_->node()->Contains(target->node());
   }
@@ skipping 58 matching lines @@
 }
 
 }  // namespace examples
 
 // static
 ApplicationDelegate* ApplicationDelegate::Create() {
   return new examples::WindowManager;
 }
 
 }  // namespace mojo