Refactoring button field and its type (2nd try)

chrome/browser/chrome_service_worker_browsertest.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.
 
 // This file tests that Service Workers (a Content feature) work in the Chromium
 // embedder.
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 573 matching lines @@
   const base::string16 expected_title2 = base::ASCIIToUTF16("Done");
   content::TitleWatcher title_watcher2(
       browser()->tab_strip_model()->GetActiveWebContents(), expected_title2);
 
   histogram_tester_.ExpectTotalCount(
       "ServiceWorker.StartWorker.StatusByPurpose_NAVIGATION_HINT_LINK_MOUSE_"
       "DOWN",
       0);
   content::SimulateMouseClickAt(
       browser()->tab_strip_model()->GetActiveWebContents(), 0,
-      blink::WebMouseEvent::ButtonLeft, gfx::Point(0, 0));
+      blink::WebMouseEvent::Button::Left, gfx::Point(0, 0));
   EXPECT_EQ(expected_title2, title_watcher2.WaitAndGetTitle());
 
   // The service worker must be started by a navigation hint.
   histogram_tester_.ExpectBucketCount(
       "ServiceWorker.StartWorker.StatusByPurpose_NAVIGATION_HINT_LINK_MOUSE_"
       "DOWN",
       0 /* SERVICE_WORKER_OK */, 1);
 }
 
 }  // namespace