Refactoring button field and its type

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 1771 matching lines @@
     BOOL handled = [responderDelegate_ handleEvent:theEvent];
     if (handled)
       return;
   }
 
   if ([self shouldIgnoreMouseEvent:theEvent]) {
     // If this is the first such event, send a mouse exit to the host view.
     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;
     return;
   }
 
   if (mouseEventWasIgnored_) {
     // If this is the first mouse event after a previous event that was ignored
     // due to the hitTest, send a mouse enter event to the host view.
     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()
             ->RouteMouseEvent(renderWidgetHostView_.get(), &enterEvent);
       } else {
         ui::LatencyInfo latency_info;
         latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT,
                                       0, 0);
         renderWidgetHostView_->ProcessMouseEvent(enterEvent, latency_info);
       }
@@ skipping 1244 matching lines @@
   if ([self window])
     [self updateScreenProperties];
   renderWidgetHostView_->browser_compositor_->SetNSViewAttachedToWindow(
       [self window]);
 
   // If we switch windows (or are removed from the view hierarchy), cancel any
   // open mouse-downs.
   if (hasOpenMouseDown_) {
     WebMouseEvent event;
     event.type = WebInputEvent::MouseUp;
-    event.button = WebMouseEvent::ButtonLeft;
+    event.button = WebMouseEvent::Button::Left;
     renderWidgetHostView_->ForwardMouseEvent(event);
 
     hasOpenMouseDown_ = NO;
   }
 }
 
 - (void)viewDidChangeBackingProperties {
   NSScreen* screen = [[self window] screen];
   if (screen) {
     gfx::ICCProfile icc_profile =
@@ skipping 174 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end