Convert WindowOpenDisposition to an enum class.

chrome/test/base/browser_with_test_window_test.cc

 // Copyright (c) 2012 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 "chrome/test/base/browser_with_test_window_test.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 99 matching lines @@
 #elif defined(TOOLKIT_VIEWS)
   return views_test_helper_->GetContext();
 #else
   return nullptr;
 #endif
 }
 
 void BrowserWithTestWindowTest::AddTab(Browser* browser, const GURL& url) {
   chrome::NavigateParams params(browser, url, ui::PAGE_TRANSITION_TYPED);
   params.tabstrip_index = 0;
-  params.disposition = NEW_FOREGROUND_TAB;
+  params.disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
   chrome::Navigate(&params);
   CommitPendingLoad(&params.target_contents->GetController());
 }
 
 void BrowserWithTestWindowTest::CommitPendingLoad(
   NavigationController* controller) {
   if (!controller->GetPendingEntry())
     return;  // Nothing to commit.
 
   RenderFrameHost* old_rfh = controller->GetWebContents()->GetMainFrame();
@@ skipping 98 matching lines @@
   Browser::CreateParams params(profile);
   if (hosted_app) {
     params = Browser::CreateParams::CreateForApp(
         "Test", true /* trusted_source */, gfx::Rect(), profile);
   } else {
     params.type = browser_type;
   }
   params.window = browser_window;
   return new Browser(params);
 }