Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/cocoa/constrained_window/constrained_window_mac_browsertest.mm

 // 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/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
@@ skipping 81 matching lines @@
 
 // If a tab has never been shown then the associated tab view for the web
 // content will not be created. Verify that adding a constrained window to such
 // a tab works correctly.
 IN_PROC_BROWSER_TEST_F(ConstrainedWindowMacTest, ShowInUninitializedTab) {
   std::unique_ptr<content::WebContents> web_contents(
       content::WebContents::Create(
           content::WebContents::CreateParams(browser()->profile())));
   bool was_blocked = false;
   chrome::AddWebContents(browser(), NULL, web_contents.release(),
-                         NEW_BACKGROUND_TAB, gfx::Rect(), false, &was_blocked);
+                         WindowOpenDisposition::NEW_BACKGROUND_TAB, gfx::Rect(),
+                         false, &was_blocked);
   content::WebContents* tab2 =
       browser()->tab_strip_model()->GetWebContentsAt(2);
   ASSERT_TRUE(tab2);
   EXPECT_FALSE([tab2->GetNativeView() superview]);
 
   // Show dialog and verify that it's not visible yet.
   NiceMock<ConstrainedWindowDelegateMock> delegate;
   std::unique_ptr<ConstrainedWindowMac> dialog =
       CreateAndShowWebModalDialogMac(&delegate, tab2, sheet_);
   EXPECT_FALSE([sheet_window_ isVisible]);
@@ skipping 69 matching lines @@
           ->exclusive_access_manager()
           ->fullscreen_controller()
           ->ToggleBrowserFullscreenMode();
       waiter->Wait();
     }
     EXPECT_EQ(1.0, [sheet_window_ alphaValue]);
   }
 
   dialog->CloseWebContentsModalDialog();
 }