Refactoring button field and its type

content/browser/renderer_host/render_widget_host_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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <tuple>
 
@@ skipping 560 matching lines @@
 
   void SimulateMouseMove(int x, int y, int modifiers) {
     SimulateMouseEvent(WebInputEvent::MouseMove, x, y, modifiers, false);
   }
 
   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::ButtonLeft;
+      event.button = WebMouseEvent::Button::Left;
     event.timeStampSeconds = GetNextSimulatedEventTimeSeconds();
     host_->ForwardMouseEvent(event);
   }
 
   // Inject simple synthetic WebGestureEvent instances.
   void SimulateGestureEvent(WebInputEvent::Type type,
                             WebGestureDevice sourceDevice) {
     host_->ForwardGestureEvent(
         SyntheticWebGestureEventBuilder::Build(type, sourceDevice));
   }
@@ skipping 1104 matching lines @@
                                       ui::LatencyInfo());
 
 
   // Tests RWHI::ForwardWheelEventWithLatencyInfo().
   SimulateWheelEventWithLatencyInfo(-5, 0, 0, true, ui::LatencyInfo());
 
   ASSERT_FALSE(host_->input_router()->HasPendingEvents());
 }
 
 }  // namespace content