Remove unused feedback class in dom distiller component

components/dom_distiller/content/browser/distiller_ui_handle.h

Index: components/dom_distiller/content/browser/distiller_ui_handle.h
diff --git a/components/dom_distiller/content/browser/distiller_ui_handle.h b/components/dom_distiller/content/browser/distiller_ui_handle.h
index d374859e829694d58db27d3a32b173e5b2218b3a..d97384eafd5279ac6b279f1fe419b453a3c00146 100644
--- a/components/dom_distiller/content/browser/distiller_ui_handle.h
+++ b/components/dom_distiller/content/browser/distiller_ui_handle.h
@@ -18,11 +18,6 @@ class DistillerUIHandle {
   DistillerUIHandle() {}
   virtual ~DistillerUIHandle() {}
 
-  // Start an external form to record user feedback.
-  virtual void ReportExternalFeedback(content::WebContents* web_contents,
-                                      const GURL& url,
-                                      const bool good) = 0;
-
   // Open the UI settings for dom distiller.
   virtual void OpenSettings(content::WebContents* web_contents) = 0;