Convert WindowOpenDisposition to an enum class.

content/browser/web_contents/web_drag_dest_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.
 
 #import "content/browser/web_contents/web_drag_dest_mac.h"
 
 #import <Carbon/Carbon.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 217 matching lines @@
                               view:(NSView*)view {
   if (currentRVH_ != webContents_->GetRenderViewHost())
     [self draggingEntered:info view:view];
 
   // Check if we only allow navigation and navigate to a url on the pasteboard.
   if ([self onlyAllowsNavigation]) {
     NSPasteboard* pboard = [info draggingPasteboard];
     if ([pboard containsURLDataConvertingTextToURL:YES]) {
       GURL url;
       ui::PopulateURLAndTitleFromPasteboard(&url, NULL, pboard, YES);
-      webContents_->OpenURL(OpenURLParams(
-          url, Referrer(), CURRENT_TAB, ui::PAGE_TRANSITION_AUTO_BOOKMARK,
-          false));
+      webContents_->OpenURL(
+          OpenURLParams(url, Referrer(), WindowOpenDisposition::CURRENT_TAB,
+                        ui::PAGE_TRANSITION_AUTO_BOOKMARK, false));
       return YES;
     } else {
       return NO;
     }
   }
 
   if (delegate_)
     delegate_->OnDrop();
 
   currentRVH_ = NULL;
@@ skipping 72 matching lines @@
   // Get custom MIME data.
   if ([types containsObject:ui::kWebCustomDataPboardType]) {
     NSData* customData = [pboard dataForType:ui::kWebCustomDataPboardType];
     ui::ReadCustomDataIntoMap([customData bytes],
                               [customData length],
                               &data->custom_data);
   }
 }
 
 @end