Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/webui/chrome_web_contents_handler.cc

Index: chrome/browser/ui/webui/chrome_web_contents_handler.cc
diff --git a/chrome/browser/ui/webui/chrome_web_contents_handler.cc b/chrome/browser/ui/webui/chrome_web_contents_handler.cc
index 4bc2b65f9df96ab8c9ac5d15c0f8f76794867bae..7f5fd4d0858a3cccd175f00e3b5b4740f7238e74 100644
--- a/chrome/browser/ui/webui/chrome_web_contents_handler.cc
+++ b/chrome/browser/ui/webui/chrome_web_contents_handler.cc
@@ -43,10 +43,11 @@ WebContents* ChromeWebContentsHandler::OpenURLFromTab(
     browser = new Browser(Browser::CreateParams(Browser::TYPE_TABBED, profile));
   chrome::NavigateParams nav_params(browser, params.url, params.transition);
   nav_params.referrer = params.referrer;
-  if (source && source->IsCrashed() && params.disposition == CURRENT_TAB &&
+  if (source && source->IsCrashed() &&
+      params.disposition == WindowOpenDisposition::CURRENT_TAB &&
       ui::PageTransitionCoreTypeIs(params.transition,
                                    ui::PAGE_TRANSITION_LINK)) {
-    nav_params.disposition = NEW_FOREGROUND_TAB;
+    nav_params.disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
   } else {
     nav_params.disposition = params.disposition;
   }