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

ui/base/dragdrop/os_exchange_data_provider_aurax11.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_AURAX11_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURAX11_H_
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
@@ skipping 48 matching lines @@
   // Overridden from OSExchangeData::Provider:
   virtual Provider* Clone() const OVERRIDE;
   virtual void SetString(const base::string16& data) OVERRIDE;
   virtual void SetURL(const GURL& url, const base::string16& title) OVERRIDE;
   virtual void SetFilename(const base::FilePath& path) OVERRIDE;
   virtual void SetFilenames(
       const std::vector<OSExchangeData::FileInfo>& filenames) OVERRIDE;
   virtual void SetPickledData(const OSExchangeData::CustomFormat& format,
                               const Pickle& pickle) OVERRIDE;
   virtual bool GetString(base::string16* data) const OVERRIDE;
-  virtual bool GetURLAndTitle(GURL* url, base::string16* title) const OVERRIDE;
+  virtual bool GetURLAndTitle(OSExchangeData::FilenameToURLPolicy policy,
+                              GURL* url,
+                              base::string16* title) const OVERRIDE;
   virtual bool GetFilename(base::FilePath* path) const OVERRIDE;
   virtual bool GetFilenames(
       std::vector<OSExchangeData::FileInfo>* filenames) const OVERRIDE;
   virtual bool GetPickledData(const OSExchangeData::CustomFormat& format,
                               Pickle* pickle) const OVERRIDE;
   virtual bool HasString() const OVERRIDE;
   virtual bool HasURL() const OVERRIDE;
   virtual bool HasFile() const OVERRIDE;
   virtual bool HasCustomFormat(const OSExchangeData::CustomFormat& format) const
       OVERRIDE;
@@ skipping 48 matching lines @@
 
   // Takes a snapshot of |format_map_| and offers it to other windows.
   mutable SelectionOwner selection_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderAuraX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURAX11_H_