Add an about:flag to support alternative data saver features

components/data_reduction_proxy/content/browser/content_lofi_decider.h

 // Copyright 2015 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 COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_
 
 #include "components/data_reduction_proxy/core/common/lofi_decider.h"
 #include "base/macros.h"
 
@@ skipping 20 matching lines @@
   void MaybeSetAcceptTransformHeader(
       const net::URLRequest& request,
       bool are_previews_disabled,
       net::HttpRequestHeaders* headers) const override;
   bool IsSlowPagePreviewRequested(
       const net::HttpRequestHeaders& headers) const override;
   bool IsLitePagePreviewRequested(
       const net::HttpRequestHeaders& headers) const override;
   void RemoveAcceptTransformHeader(
       net::HttpRequestHeaders* headers) const override;
-  void MaybeSetIgnorePreviewsBlacklistDirective(
-      net::HttpRequestHeaders* headers) const override;
   bool ShouldRecordLoFiUMA(const net::URLRequest& request) const override;
   bool IsClientLoFiImageRequest(const net::URLRequest& request) const override;
   bool IsClientLoFiAutoReloadRequest(
       const net::URLRequest& request) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentLoFiDecider);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_