Convert WindowOpenDisposition to an enum class.

content/public/browser/page_navigator.cc

 // 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/public/browser/page_navigator.h"
 
 namespace content {
 
 OpenURLParams::OpenURLParams(
     const GURL& url,
@@ skipping 26 matching lines @@
       disposition(disposition),
       transition(transition),
       is_renderer_initiated(is_renderer_initiated),
       should_replace_current_entry(false),
       user_gesture(!is_renderer_initiated) {
 }
 
 OpenURLParams::OpenURLParams()
     : uses_post(false),
       frame_tree_node_id(-1),
-      disposition(UNKNOWN),
+      disposition(WindowOpenDisposition::UNKNOWN),
       transition(ui::PAGE_TRANSITION_LINK),
       is_renderer_initiated(false),
       should_replace_current_entry(false),
-      user_gesture(true) {
-}
+      user_gesture(true) {}
 
 OpenURLParams::OpenURLParams(const OpenURLParams& other) = default;
 
 OpenURLParams::~OpenURLParams() {
 }
 
 }  // namespace content