Stop using UIPasteboardChangedNotification.

components/open_from_clipboard/fake_clipboard_recent_content.h

 // Copyright 2015 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 COMPONENTS_OPEN_FROM_CLIPBOARD_FAKE_CLIPBOARD_RECENT_CONTENT_H_
 #define COMPONENTS_OPEN_FROM_CLIPBOARD_FAKE_CLIPBOARD_RECENT_CONTENT_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/open_from_clipboard/clipboard_recent_content.h"
 #include "url/gurl.h"
 
 // FakeClipboardRecentContent implements ClipboardRecentContent interface by
 // returning configurable values for use by tests.
 class FakeClipboardRecentContent : public ClipboardRecentContent {
  public:
   FakeClipboardRecentContent();
   ~FakeClipboardRecentContent() override;
 
   // ClipboardRecentContent implementation.
-  bool GetRecentURLFromClipboard(GURL* url) const override;
+  bool GetRecentURLFromClipboard(GURL* url) override;
   base::TimeDelta GetClipboardContentAge() const override;
   void SuppressClipboardContent() override;
-  void RecentURLDisplayed() override;
 
   // Sets the URL and clipboard content age.
   void SetClipboardContent(const GURL& url, base::TimeDelta content_age);
 
  private:
   GURL clipboard_content_;
   base::TimeDelta content_age_;
   bool suppress_content_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeClipboardRecentContent);
 };
 
 #endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_FAKE_CLIPBOARD_RECENT_CONTENT_H_