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

chrome/browser/ui/android/context_menu_helper.h

Index: chrome/browser/ui/android/context_menu_helper.h
diff --git a/chrome/browser/ui/android/context_menu_helper.h b/chrome/browser/ui/android/context_menu_helper.h
index 9f84b6c32a8242510a2913283859a9b0e2d69e49..f57a980ab76af35bb49bb1b2406ae25d40459f48 100644
--- a/chrome/browser/ui/android/context_menu_helper.h
+++ b/chrome/browser/ui/android/context_menu_helper.h
@@ -26,7 +26,8 @@ class ContextMenuHelper
   void SetPopulator(jobject jpopulator);
 
   // Methods called from Java via JNI ------------------------------------------
-  void OnStartDownload(JNIEnv* env, jobject obj, jboolean jis_link);
+  void OnStartDownload(
+      JNIEnv* env, jobject obj, jboolean jis_link, jstring jheaders);
 
  private:
   explicit ContextMenuHelper(content::WebContents* web_contents);