Convert WindowOpenDisposition to an enum class.

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm

 // Copyright 2013 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/renderer_host/chrome_render_widget_host_view_mac_history_swiper.h"
 
 #import "base/mac/sdk_forward_declarations.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 359 matching lines @@
     return [NSEvent isSwipeTrackingFromScrollEventsEnabled];
   return NO;
 }
 
 - (void)navigateBrowserInDirection:
             (history_swiper::NavigationDirection)direction {
   Browser* browser = chrome::FindBrowserWithWindow(
       historyOverlay_.view.window);
   if (browser) {
     if (direction == history_swiper::kForwards)
-      chrome::GoForward(browser, CURRENT_TAB);
+      chrome::GoForward(browser, WindowOpenDisposition::CURRENT_TAB);
     else
-      chrome::GoBack(browser, CURRENT_TAB);
+      chrome::GoBack(browser, WindowOpenDisposition::CURRENT_TAB);
   }
 }
 
 - (BOOL)browserCanNavigateInDirection:
         (history_swiper::NavigationDirection)direction
                                 event:(NSEvent*)event {
   Browser* browser = chrome::FindBrowserWithWindow([event window]);
   if (!browser)
     return NO;
 
@@ skipping 82 matching lines @@
           progress = MAX(0.0, progress);
           progress = MIN(1.0, progress);
           [historyOverlay setProgress:progress finished:finished];
 
           // |gestureAmount| obeys -[NSEvent isDirectionInvertedFromDevice]
           // automatically.
           Browser* browser =
               chrome::FindBrowserWithWindow(historyOverlay.view.window);
           if (ended && browser) {
             if (isRightScroll)
-              chrome::GoForward(browser, CURRENT_TAB);
+              chrome::GoForward(browser, WindowOpenDisposition::CURRENT_TAB);
             else
-              chrome::GoBack(browser, CURRENT_TAB);
+              chrome::GoBack(browser, WindowOpenDisposition::CURRENT_TAB);
           }
 
           if (ended || isComplete) {
             [historyOverlay dismiss];
             [historyOverlay release];
             historyOverlay = nil;
           }
       }];
 }
 
@@ skipping 85 matching lines @@
   }
 }
 
 @end
 
 @implementation HistorySwiper (PrivateExposedForTesting)
 + (void)resetMagicMouseState {
   forceMagicMouse = NO;
 }
 @end