Factor DRP PreviewsState logic out of content

content/renderer/previews_state_helper.h

Index: content/renderer/previews_state_helper.h
diff --git a/content/renderer/previews_state_helper.h b/content/renderer/previews_state_helper.h
deleted file mode 100644
index c4050953e74aec4a8ce7f784107f47c0095b3979..0000000000000000000000000000000000000000
--- a/content/renderer/previews_state_helper.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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_PREVIEWS_STATE_HELPER_H_
-#define CONTENT_RENDERER_PREVIEWS_STATE_HELPER_H_
-
-#include "content/public/common/previews_state.h"
-#include "third_party/WebKit/public/platform/WebURLResponse.h"
-
-namespace content {
-
-// Determines and returns an updated PreviewsState value for a main frame
-// based on its |original_state| value and its |web_url_response|.
-CONTENT_EXPORT PreviewsState GetPreviewsStateFromMainFrameResponse(
-    PreviewsState original_state,
-    const blink::WebURLResponse& web_url_response);
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_PREVIEWS_STATE_HELPER_H_