Remove the retargeting notification

chrome/browser/chrome_notification_types.h

 // Copyright 2012 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_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_BROWSER_CHROME_NOTIFICATION_TYPES_H_
 
 #include "build/build_config.h"
 #include "extensions/features/features.h"
 
@@ skipping 65 matching lines @@
 #if defined(USE_AURA)
   // The user has changed the fling curve configuration.
   // Source<GesturePrefsObserver>. There are no details.
   NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED,
 #endif  // defined(USE_AURA)
 
   // Sent when the renderer returns focus to the browser, as part of focus
   // traversal. The source is the browser, there are no details.
   NOTIFICATION_FOCUS_RETURNED_TO_BROWSER,
 
-  // A new tab is created from an existing tab to serve as a target of a
-  // navigation that is about to happen. The source will be a Source<Profile>
-  // corresponding to the profile in which the new tab will live.  Details in
-  // the form of a RetargetingDetails object are provided.
-  NOTIFICATION_RETARGETING,
-
   // Application-wide ----------------------------------------------------------
 
   // This message is sent when the application is terminating (the last
   // browser window has shutdown as part of an explicit user-initiated exit,
   // or the user closed the last browser window on Windows/Linux and there are
   // no BackgroundContents keeping the browser running). No source or details
   // are passed.
   NOTIFICATION_APP_TERMINATING,
 
 #if defined(OS_MACOSX)
@@ skipping 373 matching lines @@
   // Note:-
   // Currently only Content and Chrome define and use notifications.
   // Custom notifications not belonging to Content and Chrome should start
   // from here.
   NOTIFICATION_CHROME_END,
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_NOTIFICATION_TYPES_H_