Merge CWVWebsiteDataStore into CWVWebViewConfiguration.

ios/web_view/internal/cwv_web_view_configuration_internal.h

+// 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_WEB_VIEW_CONFIGURATION_INTERNAL_H_
+#define IOS_WEB_VIEW_INTERNAL_CWV_WEB_VIEW_CONFIGURATION_INTERNAL_H_
+
+#import "ios/web_view/public/cwv_web_view_configuration.h"
+
+namespace ios_web_view {
+class WebViewBrowserState;
+}  // namespace ios_web_view
+
+@interface CWVWebViewConfiguration ()
+
+// The browser state associated with this configuration.
+@property(nonatomic, readonly, nonnull)
+    ios_web_view::WebViewBrowserState* browserState;
+
+@end
+
+#endif  // IOS_WEB_VIEW_INTERNAL_CWV_WEB_VIEW_CONFIGURATION_INTERNAL_H_