Add the client for accessing Subresource Filter only list.

chrome/browser/subresource_filter/navigation_throttle_util.h

Index: chrome/browser/subresource_filter/navigation_throttle_util.h
diff --git a/chrome/browser/subresource_filter/navigation_throttle_util.h b/chrome/browser/subresource_filter/navigation_throttle_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..99ed9e64affb90005c5cb56aacd3e55802dbb090
--- /dev/null
+++ b/chrome/browser/subresource_filter/navigation_throttle_util.h
@@ -0,0 +1,21 @@
+// Copyright (c) 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 CHROME_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_UTIL_H_
+#define CHROME_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_UTIL_H_
+
+#include "content/public/browser/navigation_throttle.h"
+
+namespace safe_browsing {
+class SafeBrowsingService;
+}
+
+// Creates the CreateSubresourceFilterNavigationThrottle for the main frame and
+// the |safe_browsing_service| supporting pver4, |safe_browsing_service| can be
+// a nullptr.
+content::NavigationThrottle* MaybeCreateSubresourceFilterNavigationThrottle(
+    content::NavigationHandle* navigation_handle,
+    safe_browsing::SafeBrowsingService* safe_browsing_service);
+
+#endif  // CHROME_BROWSER_SUBRESOURCE_FILTER_NAVIGATION_THROTTLE_UTIL_H_