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

ui/base/dragdrop/os_exchange_data_provider_aura.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 "ui/base/dragdrop/os_exchange_data_provider_aura.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/net_util.h"
 #include "ui/base/clipboard/clipboard.h"
@@ skipping 55 matching lines @@
   formats_ |= OSExchangeData::PICKLED_DATA;
 }
 
 bool OSExchangeDataProviderAura::GetString(base::string16* data) const {
   if ((formats_ & OSExchangeData::STRING) == 0)
     return false;
   *data = string_;
   return true;
 }
 
-bool OSExchangeDataProviderAura::GetURLAndTitle(GURL* url,
-                                                base::string16* title) const {
+bool OSExchangeDataProviderAura::GetURLAndTitle(
+    OSExchangeData::FilenameToURLPolicy policy,
+    GURL* url,
+    base::string16* title) const {
+  // TODO(dcheng): implement filename conversion.
   if ((formats_ & OSExchangeData::URL) == 0) {
     title->clear();
     return GetPlainTextURL(url);
   }
 
   if (!url_.is_valid())
     return false;
 
   *url = url_;
   *title = title_;
@@ skipping 99 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderAura();
 }
 
 }  // namespace ui