Revert of Refactoring button field and its type

content/browser/renderer_host/render_widget_host_view_aura_unittest.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <tuple>
@@ skipping 738 matching lines @@
   }
 
   void SimulateMouseEvent(WebInputEvent::Type type,
                           int x,
                           int y,
                           int modifiers,
                           bool pressed) {
     WebMouseEvent event =
         SyntheticWebMouseEventBuilder::Build(type, x, y, modifiers);
     if (pressed)
-      event.button = WebMouseEvent::Button::Left;
+      event.button = WebMouseEvent::ButtonLeft;
     widget_host_->ForwardMouseEvent(event);
   }
 
   void SimulateWheelEventWithPhase(WebMouseWheelEvent::Phase phase) {
     widget_host_->ForwardWheelEvent(
         SyntheticWebMouseWheelEventBuilder::Build(phase));
   }
 
   // Inject provided synthetic WebGestureEvent instance.
   void SimulateGestureEventCore(const WebGestureEvent& gesture_event) {
@@ skipping 3801 matching lines @@
 
     // Retrieve the selected text from clipboard and verify it is as expected.
     base::string16 result_text;
     clipboard->ReadText(ui::CLIPBOARD_TYPE_SELECTION, &result_text);
     EXPECT_EQ(expected_text, result_text);
   }
 }
 #endif
 
 }  // namespace content