Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/cocoa/apps/native_app_window_cocoa_browsertest.mm

 // Copyright 2013 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 "extensions/browser/app_window/native_app_window.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
@@ skipping 48 matching lines @@
 
   void SetUpAppWithWindows(int num_windows) {
     app_ = InstallExtension(
         test_data_dir_.AppendASCII("platform_apps").AppendASCII("minimal"), 1);
     EXPECT_TRUE(app_);
 
     for (int i = 0; i < num_windows; ++i) {
       content::WindowedNotificationObserver app_loaded_observer(
           content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
           content::NotificationService::AllSources());
-      OpenApplication(
-          AppLaunchParams(profile(), app_, extensions::LAUNCH_CONTAINER_NONE,
-                          NEW_WINDOW, extensions::SOURCE_TEST));
+      OpenApplication(AppLaunchParams(
+          profile(), app_, extensions::LAUNCH_CONTAINER_NONE,
+          WindowOpenDisposition::NEW_WINDOW, extensions::SOURCE_TEST));
       app_loaded_observer.Wait();
     }
   }
 
   const extensions::Extension* app_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowCocoaBrowserTest);
 };
 
@@ skipping 607 matching lines @@
   [expected_color getComponents:expected_components];
   [color getComponents:color_components];
   EXPECT_NEAR(expected_components[0], color_components[0], 0.01);
   EXPECT_NEAR(expected_components[1], color_components[1], 0.01);
   EXPECT_NEAR(expected_components[2], color_components[2], 0.01);
 }
 
 INSTANTIATE_TEST_CASE_P(NativeAppWindowCocoaBrowserTestInstance,
                         NativeAppWindowCocoaBrowserTest,
                         ::testing::Bool());