Allow empty strings to be written to the clipboard

content/browser/web_contents/web_contents_drag_win.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.
 
 #include "content/browser/web_contents/web_contents_drag_win.h"
 
 #include <windows.h>
 
 #include <string>
 
@@ skipping 264 matching lines @@
     PrepareDragForDownload(drop_data, &data, page_url, page_encoding);
 
     // Set the observer.
     ui::OSExchangeDataProviderWin::GetDataObjectImpl(data)->set_observer(this);
   } else {
     // We set the file contents before the URL because the URL also sets file
     // contents (to a .URL shortcut).  We want to prefer file content data over
     // a shortcut so we add it first.
     if (!drop_data.file_contents.empty())
       PrepareDragForFileContents(drop_data, &data);
-    if (!drop_data.text_html.empty())
-      data.SetHtml(drop_data.text_html, drop_data.html_base_url);
+    if (!drop_data.html.string().empty())
+      data.SetHtml(drop_data.html.string(), drop_data.html_base_url);
     // We set the text contents before the URL because the URL also sets text
     // content.
-    if (!drop_data.plain_text.empty())
-      data.SetString(drop_data.plain_text);
+    if (!drop_data.text.string().empty())
+      data.SetString(drop_data.text.string());
     if (drop_data.url.is_valid())
       PrepareDragForUrl(drop_data, &data);
     if (!drop_data.custom_data.empty()) {
       Pickle pickle;
       ui::WriteCustomDataToPickle(drop_data.custom_data, &pickle);
       data.SetPickledData(ui::ClipboardUtil::GetWebCustomDataFormat()->cfFormat,
                           pickle);
     }
   }
 
@@ skipping 65 matching lines @@
 void WebContentsDragWin::OnDataObjectDisposed() {
   DCHECK(drag_drop_thread_id_ == base::PlatformThread::CurrentId());
 
   // The drag-and-drop thread is only closed after OLE is done with
   // DataObjectImpl.
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&WebContentsDragWin::CloseThread, this));
 }