Clear the clipboard closing Incognito window

ui/base/clipboard/scoped_clipboard_writer.cc

 // Copyright (c) 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.
 
 // This file implements the ScopedClipboardWriter class. Documentation on its
 // purpose can be found in our header. Documentation on the format of the
 // parameters for each clipboard target can be found in clipboard.h.
 
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 
 #include "base/pickle.h"
 #include "base/utf_string_conversions.h"
 #include "ui/gfx/size.h"
 
 namespace ui {
 
 ScopedClipboardWriter::ScopedClipboardWriter(Clipboard* clipboard,
                                              Clipboard::Buffer buffer)
     : clipboard_(clipboard),
-      buffer_(buffer) {
+      buffer_(buffer),
+      source_tag_() {
+}
+
+ScopedClipboardWriter::ScopedClipboardWriter(Clipboard* clipboard,
+                                             Clipboard::Buffer buffer,
+                                             Clipboard::SourceTag source_tag)
+    : clipboard_(clipboard),
+      buffer_(buffer),
+      source_tag_(source_tag) {
 }
 
 ScopedClipboardWriter::~ScopedClipboardWriter() {
   if (!objects_.empty() && clipboard_)
-    clipboard_->WriteObjects(buffer_, objects_);
+    clipboard_->WriteObjects(buffer_, objects_, source_tag_);
 }
 
 void ScopedClipboardWriter::WriteText(const string16& text) {
   WriteTextOrURL(text, false);
 }
 
 void ScopedClipboardWriter::WriteURL(const string16& text) {
   WriteTextOrURL(text, true);
 }
 
@@ skipping 102 matching lines @@
   objects_[Clipboard::CBF_TEXT] = parameters;
 
   if (is_url) {
     url_text_ = utf8_text;
   } else {
     url_text_.clear();
   }
 }
 
 }  // namespace ui