Allow empty strings to be written to the clipboard

webkit/glue/webdropdata_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 "webkit/glue/webdropdata.h"
 
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
 #include "googleurl/src/gurl.h"
 #include "ui/base/clipboard/clipboard_util_win.h"
 
 // static
 void WebDropData::PopulateWebDropData(IDataObject* data_object,
                                       WebDropData* drop_data) {
   string16 url_str;
   if (ui::ClipboardUtil::GetUrl(data_object, &url_str, &drop_data->url_title,
                                 false)) {
     GURL test_url(url_str);
     if (test_url.is_valid())
       drop_data->url = test_url;
   }
   std::vector<string16> filenames;
   ui::ClipboardUtil::GetFilenames(data_object, &filenames);
   for (size_t i = 0; i < filenames.size(); ++i)
     drop_data->filenames.push_back(FileInfo(filenames[i], string16()));
-  ui::ClipboardUtil::GetPlainText(data_object, &drop_data->plain_text);
-  std::string base_url;
-  ui::ClipboardUtil::GetHtml(data_object, &drop_data->text_html, &base_url);
-  if (!base_url.empty()) {
-    drop_data->html_base_url = GURL(base_url);
+  string16 text;
+  ui::ClipboardUtil::GetPlainText(data_object, &text);
+  if (!text.empty()) {
+    drop_data->text = NullableString16(text, false);
+  }
+  string16 html;
+  std::string html_base_url;
+  ui::ClipboardUtil::GetHtml(data_object, &html, &html_base_url);
+  if (!html.empty()) {
+    drop_data->html = NullableString16(html, false);
+  }
+  if (!html_base_url.empty()) {
+    drop_data->html_base_url = GURL(html_base_url);
   }
   ui::ClipboardUtil::GetWebCustomData(data_object,
       &drop_data->custom_data);
 }