Convert WindowOpenDisposition to an enum class.

chrome/browser/plugins/plugin_power_saver_browsertest.cc

 // Copyright 2015 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 <stdint.h>
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 295 matching lines @@
     ui_test_utils::NavigateToURL(browser(), embedded_test_server()->base_url());
     EXPECT_TRUE(content::WaitForRenderFrameReady(
         GetActiveWebContents()->GetMainFrame()));
   }
 
   // Returns the background WebContents.
   content::WebContents* LoadHTMLInBackgroundTab(const std::string& html) {
     embedded_test_server()->RegisterRequestHandler(
         base::Bind(&RespondWithHTML, html));
     ui_test_utils::NavigateToURLWithDisposition(
-        browser(), embedded_test_server()->base_url(), NEW_BACKGROUND_TAB,
+        browser(), embedded_test_server()->base_url(),
+        WindowOpenDisposition::NEW_BACKGROUND_TAB,
         ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
 
     int index = browser()->tab_strip_model()->GetIndexOfLastWebContentsOpenedBy(
         GetActiveWebContents(), 0 /* start_index */);
     content::WebContents* contents =
         browser()->tab_strip_model()->GetWebContentsAt(index);
     EXPECT_TRUE(content::WaitForRenderFrameReady(contents->GetMainFrame()));
     return contents;
   }
 
@@ skipping 401 matching lines @@
   std::string script =
       "window.document.getElementById('expand_to_peripheral').height = 200;"
       "window.document.getElementById('expand_to_peripheral').width = 200;"
       "window.document.getElementById('expand_to_essential').height = 400;"
       "window.document.getElementById('expand_to_essential').width = 400;";
   ASSERT_TRUE(content::ExecuteScript(GetActiveWebContents(), script));
 
   VerifyPluginIsThrottled(GetActiveWebContents(), "expand_to_peripheral");
   VerifyPluginMarkedEssential(GetActiveWebContents(), "expand_to_essential");
 }