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

chrome/browser/ui/cocoa/handoff_active_url_observer.h

Index: chrome/browser/ui/cocoa/handoff_active_url_observer.h
diff --git a/chrome/browser/ui/cocoa/handoff_active_url_observer.h b/chrome/browser/ui/cocoa/handoff_active_url_observer.h
deleted file mode 100644
index a46ed98ce6c71a01f1f4ed79ae10ffa910840ece..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/cocoa/handoff_active_url_observer.h
+++ /dev/null
@@ -1,83 +0,0 @@
-// 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_H_
-#define CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_H_
-
-#include "chrome/browser/ui/browser_list_observer.h"
-#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-class WebContents;
-}
-
-class Browser;
-class HandoffActiveURLObserverDelegate;
-class TabStripModel;
-
-// This class observes changes to the "active URL". This is defined as the
-// visible URL of the WebContents of the selected tab of the most recently
-// focused browser window.
-class HandoffActiveURLObserver : public chrome::BrowserListObserver,
-                                 public TabStripModelObserver,
-                                 public content::WebContentsObserver {
- public:
-  explicit HandoffActiveURLObserver(HandoffActiveURLObserverDelegate* delegate);
-  ~HandoffActiveURLObserver() override;
-
- private:
-  // chrome::BrowserListObserver
-  void OnBrowserSetLastActive(Browser* browser) override;
-  void OnBrowserRemoved(Browser* browser) override;
-
-  // TabStripModelObserver
-  void ActiveTabChanged(content::WebContents* old_contents,
-                        content::WebContents* new_contents,
-                        int index,
-                        int reason) override;
-  void TabStripModelDeleted() override;
-
-  // content::WebContentsObserver
-  void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) override;
-  void WebContentsDestroyed() override;
-
-  // This method ensures that the instance is registered as an observer of the
-  // correct TabStripModel and WebContents for |active_browser_|.
-  void UpdateObservations();
-
-  // Makes this object start observing the TabStripModel, if it is not already
-  // doing so. This method is idempotent.
-  void StartObservingTabStripModel(TabStripModel* tab_strip_model);
-
-  // Makes this object stop observing the TabStripModel.
-  void StopObservingTabStripModel();
-
-  // Makes this object start observing the WebContents, if it is not already
-  // doing so. This method is idempotent.
-  void StartObservingWebContents(content::WebContents* web_contents);
-
-  // Makes this object stop observing the WebContents.
-  void StopObservingWebContents();
-
-  // Returns the active WebContents. May return nullptr.
-  content::WebContents* GetActiveWebContents();
-
-  // Instances of this class should be owned by their |delegate_|.
-  HandoffActiveURLObserverDelegate* delegate_;
-
-  // When this pointer is not nullptr, this object is registered as an observer
-  // of the TabStripModel.
-  TabStripModel* active_tab_strip_model_;
-
-  // This pointer is always up to date, and points to the most recently
-  // activated browser, or nullptr if no browsers exist.
-  Browser* active_browser_;
-
-  DISALLOW_COPY_AND_ASSIGN(HandoffActiveURLObserver);
-};
-
-#endif  // CHROME_BROWSER_UI_COCOA_HANDOFF_ACTIVE_URL_OBSERVER_H_