Refactor Clipboard Last Modified Time Storage

components/open_from_clipboard/clipboard_recent_content_generic.h

 // Copyright 2017 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_CLIPBOARD_RECENT_CONTENT_GENERIC_H_
 #define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_GENERIC_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/open_from_clipboard/clipboard_recent_content.h"
 #include "url/gurl.h"
 
 // An implementation of ClipboardRecentContent that uses
 // ui/base/clipboard/clipboard.h
 // and hence works on all platforms for which Clipboard is implemented.
 // (This includes all platforms Chrome runs on except iOS.)
 // Note that on some platforms Clipboard may not implement the necessary
 // functions for this provider to function.  In those cases, it will not do
 // anything.
 class ClipboardRecentContentGeneric : public ClipboardRecentContent {
  public:
   explicit ClipboardRecentContentGeneric();
 
   // ClipboardRecentContent implementation.
   bool GetRecentURLFromClipboard(GURL* url) override;
   base::TimeDelta GetClipboardContentAge() const override;
   void SuppressClipboardContent() override;
 
  private:
-  // When told to suppress clipboard content, store the time of the last
-  // modified clipboard and suppress suggestions that correspond to that time.
-  // Set to base::Time() if not suppressing clipboard content.
-  base::Time last_modified_time_to_suppress_;
-
   DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContentGeneric);
 };
 
 #endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_GENERIC_H_