Move usage of WebString methods into renderer for FrameOwnerProperties

content/renderer/frame_owner_properties.h

Index: content/renderer/frame_owner_properties.h
diff --git a/content/renderer/frame_owner_properties.h b/content/renderer/frame_owner_properties.h
new file mode 100644
index 0000000000000000000000000000000000000000..05205c2c753077bed962ae96cbbd93107ad0e6d6
--- /dev/null
+++ b/content/renderer/frame_owner_properties.h
@@ -0,0 +1,22 @@
+// 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 CONTENT_RENDERER_FRAME_OWNER_PROPERTIES_H_
+#define CONTENT_RENDERER_FRAME_OWNER_PROPERTIES_H_
+
+#include "content/common/frame_owner_properties.h"
+#include "third_party/WebKit/public/web/WebFrameOwnerProperties.h"
+
+namespace content {
+
+FrameOwnerProperties ConvertWebFrameOwnerPropertiesToFrameOwnerProperties(
+    const blink::WebFrameOwnerProperties& web_frame_owner_properties);
+
+blink::WebFrameOwnerProperties
+ConvertFrameOwnerPropertiesToWebFrameOwnerProperties(
+    const FrameOwnerProperties& frame_owner_properties);
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_FRAME_OWNER_PROPERTIES_H_