Add window open and close delegate methods to CWVUIDelegate.

ios/web_view/internal/cwv_navigation_action_internal.h

Index: ios/web_view/internal/cwv_navigation_action_internal.h
diff --git a/ios/web_view/internal/cwv_navigation_action_internal.h b/ios/web_view/internal/cwv_navigation_action_internal.h
new file mode 100644
index 0000000000000000000000000000000000000000..6ac26eb95a6715695c7fadf121f76f5d42fe2af2
--- /dev/null
+++ b/ios/web_view/internal/cwv_navigation_action_internal.h
@@ -0,0 +1,20 @@
+// Copyright 2017 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.
+
+#ifndef IOS_WEB_VIEW_INTERNAL_CWV_NAVIGATION_ACTION_INTERNAL_H_
+#define IOS_WEB_VIEW_INTERNAL_CWV_NAVIGATION_ACTION_INTERNAL_H_
+
+#import "ios/web_view/public/cwv_navigation_action.h"
+
+@interface CWVNavigationAction ()
+
+- (nonnull instancetype)init NS_UNAVAILABLE;
+
+- (nonnull instancetype)initWithRequest:(nonnull NSURLRequest*)request
+                          userInitiated:(BOOL)userInitiated
+    NS_DESIGNATED_INITIALIZER;
+
+@end
+
+#endif  // IOS_WEB_VIEW_INTERNAL_CWV_NAVIGATION_ACTION_INTERNAL_H_