Remove the GoogleURLTracker infobar functionality entirely.

chrome/browser/google/chrome_google_url_tracker_client.h

 // Copyright 2014 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_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
 #define CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
 
 #include "components/google/core/browser/google_url_tracker_client.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
-class ChromeGoogleURLTrackerClient : public GoogleURLTrackerClient,
-                                     public content::NotificationObserver {
+class ChromeGoogleURLTrackerClient : public GoogleURLTrackerClient {
  public:
   explicit ChromeGoogleURLTrackerClient(Profile* profile);
   ~ChromeGoogleURLTrackerClient() override;
 
   // GoogleURLTrackerClient:
-  void SetListeningForNavigationStart(bool listen) override;
-  bool IsListeningForNavigationStart() override;
   bool IsBackgroundNetworkingEnabled() override;
   PrefService* GetPrefs() override;
   net::URLRequestContextGetter* GetRequestContext() override;
 
  private:
-  // content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
   Profile* profile_;
 
-  content::NotificationRegistrar registrar_;
-
   DISALLOW_COPY_AND_ASSIGN(ChromeGoogleURLTrackerClient);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_