Revert "mac: Allow Chrome to hand off its active URL to other devices."

chrome/browser/ui/cocoa/handoff_active_url_observer_delegate.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_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_DELEGATE_H_
-#define CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_DELEGATE_H_
-
-namespace content {
-class WebContents;
-}
-
-// The delegate for a HandoffActiveURLObserver.
-class HandoffActiveURLObserverDelegate {
- public:
-  // Called when:
-  //   1. The most recently focused browser changes.
-  //   2. The active tab of the browser changes.
-  //   3. After a navigation of the web contents of the active tab.
-  // |web_contents| is the WebContents whose VisibleURL is considered the
-  // "Active URL" of Chrome.
-  virtual void HandoffActiveURLChanged(content::WebContents* web_contents) = 0;
-
- protected:
-  virtual ~HandoffActiveURLObserverDelegate(){};
-};
-
-#endif  // CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_DELEGATE_H_