Don't populate URL data in WebDropData when dragging files.

ui/base/dragdrop/os_exchange_data_provider_win.h

 // 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.
 
 #ifndef UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 
 #include <objidl.h>
 #include <shlobj.h>
 #include <string>
@@ skipping 143 matching lines @@
   virtual void SetFilename(const base::FilePath& path);
   virtual void SetFilenames(
       const std::vector<OSExchangeData::FileInfo>& filenames);
   virtual void SetPickledData(const OSExchangeData::CustomFormat& format,
                               const Pickle& data);
   virtual void SetFileContents(const base::FilePath& filename,
                                const std::string& file_contents);
   virtual void SetHtml(const base::string16& html, const GURL& base_url);
 
   virtual bool GetString(base::string16* data) const;
-  virtual bool GetURLAndTitle(GURL* url, base::string16* title) const;
+  virtual bool GetURLAndTitle(OSExchangeData::FilenameToURLPolicy policy,
+                              GURL* url,
+                              base::string16* title) const;
   virtual bool GetFilename(base::FilePath* path) const;
   virtual bool GetFilenames(
       std::vector<OSExchangeData::FileInfo>* filenames) const;
   virtual bool GetPickledData(const OSExchangeData::CustomFormat& format,
                               Pickle* data) const;
   virtual bool GetFileContents(base::FilePath* filename,
                                std::string* file_contents) const;
   virtual bool GetHtml(base::string16* html, GURL* base_url) const;
   virtual bool HasString() const;
   virtual bool HasURL() const;
@@ skipping 21 matching lines @@
   gfx::ImageSkia drag_image_;
   gfx::Vector2d drag_image_offset_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderWin);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_