Don't populate WebDropData with file URLs when dragging files.

app/clipboard/clipboard_util_win.h

 // Copyright (c) 2009 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.
 //
 // Some helper functions for working with the clipboard and IDataObjects.
 
 #ifndef APP_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 #define APP_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 
 #include <shlobj.h>
@@ skipping 26 matching lines @@
   static bool HasUrl(IDataObject* data_object);
   static bool HasFilenames(IDataObject* data_object);
   static bool HasPlainText(IDataObject* data_object);
   static bool HasFileContents(IDataObject* data_object);
   static bool HasHtml(IDataObject* data_object);
 
   /////////////////////////////////////////////////////////////////////////////
   // Helper methods to extract information from an IDataObject.  These methods
   // return true if the requested data type is found in |data_object|.
   static bool GetUrl(IDataObject* data_object,
-      std::wstring* url, std::wstring* title);
+      std::wstring* url, std::wstring* title, bool convert_filenames);
   static bool GetFilenames(IDataObject* data_object,
                            std::vector<std::wstring>* filenames);
   static bool GetPlainText(IDataObject* data_object, std::wstring* plain_text);
   static bool GetHtml(IDataObject* data_object, std::wstring* text_html,
                       std::string* base_url);
   static bool GetFileContents(IDataObject* data_object,
                               std::wstring* filename,
                               std::string* file_contents);
 
   // A helper method for converting between MS CF_HTML format and plain
   // text/html.
   static std::string HtmlToCFHtml(const std::string& html,
                                   const std::string& base_url);
   static void CFHtmlToHtml(const std::string& cf_html, std::string* html,
                            std::string* base_url);
 };
 
 #endif  // APP_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_