Save image should download the original image when Data Saver is enabled.

content/browser/android/download_controller_android_impl.h

 // Copyright (c) 2012 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.
 
 // This class pairs with DownloadController on Java side to forward requests
 // for GET downloads to the current DownloadListener. POST downloads are
 // handled on the native side.
 //
 // Both classes are Singleton classes. C++ object owns Java object.
 //
@@ skipping 70 matching lines @@
   DownloadControllerAndroidImpl();
   ~DownloadControllerAndroidImpl() override;
 
   // DownloadControllerAndroid implementation.
   void CreateGETDownload(int render_process_id,
                          int render_view_id,
                          int request_id) override;
   void OnDownloadStarted(DownloadItem* download_item) override;
   void StartContextMenuDownload(const ContextMenuParams& params,
                                 WebContents* web_contents,
-                                bool is_link) override;
+                                bool is_link,
+                                const std::string& headers) override;
   void DangerousDownloadValidated(WebContents* web_contents,
                                   int download_id,
                                   bool accept) override;
 
   // DownloadItem::Observer interface.
   void OnDownloadUpdated(DownloadItem* item) override;
 
   typedef base::Callback<void(const DownloadInfoAndroid&)>
       GetDownloadInfoCB;
   void PrepareDownloadInfo(const GlobalRequestID& global_id,
@@ skipping 28 matching lines @@
   JavaObject* java_object_;
 
   ScopedVector<DeferredDownloadObserver> deferred_downloads_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadControllerAndroidImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_IMPL_H_