Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/cocoa/bookmarks/bookmark_folder_target.mm

 // Copyright (c) 2011 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 "chrome/browser/ui/cocoa/bookmarks/bookmark_folder_target.h"
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.h"
@@ skipping 47 matching lines @@
   // hover-open or "open folder" due to a click.  It doesn't matter
   // (both do the same thing) unless a modifier is held, since
   // command-click should "open all" but command-move should not.
   // WindowOpenDispositionFromNSEvent does not consider the event
   // type; only the modifiers.  Thus the need for an extra
   // event-type-check here.
   DCHECK([sender bookmarkNode]->is_folder());
   NSEvent* event = [NSApp currentEvent];
   WindowOpenDisposition disposition =
       ui::WindowOpenDispositionFromNSEvent(event);
-  if (([event type] != NSMouseEntered) &&
-      ([event type] != NSMouseMoved) &&
+  if (([event type] != NSMouseEntered) && ([event type] != NSMouseMoved) &&
       ([event type] != NSScrollWheel) &&
-      (disposition == NEW_BACKGROUND_TAB)) {
+      (disposition == WindowOpenDisposition::NEW_BACKGROUND_TAB)) {
     [controller_ closeAllBookmarkFolders];
     [controller_ openAll:[sender bookmarkNode] disposition:disposition];
     return;
   }
 
   // If click on same folder, close it and be done.
   // Else we clicked on a different folder so more work to do.
   if ([[controller_ folderController] parentButton] == sender) {
     [controller_ closeBookmarkFolder:controller_];
     return;
@@ skipping 18 matching lines @@
     item = PasteboardItemFromBookmarks(data.elements, profile_->GetPath());
   }
 
   [item
       setData:[NSData dataWithBytes:&button length:sizeof(button)]
       forType:ui::ClipboardUtil::UTIForPasteboardType(kBookmarkButtonDragType)];
   return item;
 }
 
 @end