Remove the retargeting notification

chrome/browser/tab_contents/retargeting_details.h

-// Copyright (c) 2011 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 CHROME_BROWSER_TAB_CONTENTS_RETARGETING_DETAILS_H_
-#define CHROME_BROWSER_TAB_CONTENTS_RETARGETING_DETAILS_H_
-
-#include <stdint.h>
-
-#include "url/gurl.h"
-
-namespace content {
-class WebContents;
-}
-
-// Details sent for NOTIFICATION_RETARGETING.
-struct RetargetingDetails {
-  // The source tab contents.
-  content::WebContents* source_web_contents;
-
-  // The RenderProcessHost id of the source render frame from which the
-  // retargeting was triggered.
-  int source_render_process_id;
-
-  // The routing id of the source render frame from which the retargeting was
-  // triggered.
-  int64_t source_render_frame_id;
-
-  // The target URL.
-  GURL target_url;
-
-  // The target tab contents.
-  content::WebContents* target_web_contents;
-
-  // True if the target_web_contents is not yet inserted into a tab strip.
-  bool not_yet_in_tabstrip;
-};
-
-#endif  // CHROME_BROWSER_TAB_CONTENTS_RETARGETING_DETAILS_H_