Refactoring button field and its type (2nd try)

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 327 matching lines @@
   // a status message indicating that it is essential. The test plugin sends a
   // status message during:
   //  - Plugin creation, to handle a plugin freshly created from a poster.
   //  - Peripheral status change.
   //  - In response to the explicit 'getPowerSaverStatus' request, in case the
   //    test has missed the above two events.
   void SimulateClickAndAwaitMarkedEssential(const std::string& element_id,
                                             const gfx::Point& point) {
     WaitForPlaceholderReady(GetActiveWebContents(), element_id);
     content::SimulateMouseClickAt(GetActiveWebContents(), 0 /* modifiers */,
-                                  blink::WebMouseEvent::ButtonLeft, point);
+                                  blink::WebMouseEvent::Button::Left, point);
 
     VerifyPluginMarkedEssential(GetActiveWebContents(), element_id);
   }
 
   // |element_id| must be an element on the foreground tab.
   void VerifyPluginIsPlaceholderOnly(const std::string& element_id) {
     EXPECT_FALSE(PluginLoaded(GetActiveWebContents(), element_id));
     WaitForPlaceholderReady(GetActiveWebContents(), element_id);
   }
 
@@ skipping 369 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");
 }