Remove the retargeting notification

chrome/browser/safe_browsing/safe_browsing_navigation_observer.h

 // Copyright 2016 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_SAFE_BROWSING_SAFE_BROWSING_NAVIGATION_OBSERVER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_NAVIGATION_OBSERVER_H_
 
 #include "base/supports_user_data.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "url/gurl.h"
@@ skipping 80 matching lines @@
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidRedirectNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidGetResourceResponseStart(
       const content::ResourceRequestDetails& details) override;
   void DidGetUserInteraction(const blink::WebInputEvent::Type type) override;
   void WebContentsDestroyed() override;
+  void DidOpenRequestedURL(content::WebContents* new_contents,
+                           content::RenderFrameHost* source_render_frame_host,
+                           const GURL& url,
+                           const content::Referrer& referrer,
+                           WindowOpenDisposition disposition,
+                           ui::PageTransition transition,
+                           bool started_from_context_menu,
+                           bool renderer_initiated) override;
 
   // Map keyed on NavigationHandle* to keep track of all the ongoing navigation
   // events. NavigationHandle pointers are owned by RenderFrameHost. Since a
   // NavigationHandle object will be destructed after navigation is done,
   // at the end of DidFinishNavigation(...) corresponding entries in this map
   // will be removed from navigation_handle_map_ and added to
   // SafeBrowsingNavigationObserverManager::navigation_map_.
   NavigationHandleMap navigation_handle_map_;
 
   scoped_refptr<SafeBrowsingNavigationObserverManager> manager_;
 
   // If the observed WebContents just got an user gesture.
   bool has_user_gesture_;
 
   base::Time last_user_gesture_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingNavigationObserver);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_NAVIGATION_OBSERVER_H_