Refactoring button field and its type (2nd try)

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index b2e6febebfba36cc68fd90cd3f19b6f43ed6ef47..e7978584a18548cc410cf9318251b552831f4110 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1786,7 +1786,7 @@ void RenderWidgetHostViewMac::OnDisplayMetricsChanged(
     if (!mouseEventWasIgnored_ && renderWidgetHostView_->render_widget_host_) {
       WebMouseEvent exitEvent = WebMouseEventBuilder::Build(theEvent, self);
       exitEvent.type = WebInputEvent::MouseLeave;
-      exitEvent.button = WebMouseEvent::ButtonNone;
+      exitEvent.button = WebMouseEvent::Button::NoButton;
       renderWidgetHostView_->ForwardMouseEvent(exitEvent);
     }
     mouseEventWasIgnored_ = YES;
@@ -1799,7 +1799,7 @@ void RenderWidgetHostViewMac::OnDisplayMetricsChanged(
     if (renderWidgetHostView_->render_widget_host_) {
       WebMouseEvent enterEvent = WebMouseEventBuilder::Build(theEvent, self);
       enterEvent.type = WebInputEvent::MouseMove;
-      enterEvent.button = WebMouseEvent::ButtonNone;
+      enterEvent.button = WebMouseEvent::Button::NoButton;
       if (renderWidgetHostView_->ShouldRouteEvent(enterEvent)) {
         renderWidgetHostView_->render_widget_host_->delegate()
             ->GetInputEventRouter()
@@ -3070,7 +3070,7 @@ extern NSString *NSTextInputReplacementRangeAttributeName;
   if (hasOpenMouseDown_) {
     WebMouseEvent event;
     event.type = WebInputEvent::MouseUp;
-    event.button = WebMouseEvent::ButtonLeft;
+    event.button = WebMouseEvent::Button::Left;
     renderWidgetHostView_->ForwardMouseEvent(event);
 
     hasOpenMouseDown_ = NO;