Fix deadlock between UI thread and drag and drop thread on Windows.

ui/base/dragdrop/os_exchange_data.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.h"
 
 #include "base/pickle.h"
 #include "googleurl/src/gurl.h"
 
 namespace ui {
@@ skipping 138 matching lines @@
                                      const std::string& file_contents) {
   provider_->SetFileContents(filename, file_contents);
 }
 
 bool OSExchangeData::GetFileContents(base::FilePath* filename,
                                      std::string* file_contents) const {
   return provider_->GetFileContents(filename, file_contents);
 }
 
 void OSExchangeData::SetDownloadFileInfo(const DownloadFileInfo& download) {
-  return provider_->SetDownloadFileInfo(download);
+  provider_->SetDownloadFileInfo(download);
+}
+
+void OSExchangeData::SetInDragLoop(bool in_drag_loop) {
+  provider_->SetInDragLoop(in_drag_loop);
 }
 #endif
 
 #if defined(OS_WIN) || defined(USE_AURA)
 void OSExchangeData::SetHtml(const string16& html, const GURL& base_url) {
   provider_->SetHtml(html, base_url);
 }
 
 bool OSExchangeData::GetHtml(string16* html, GURL* base_url) const {
   return provider_->GetHtml(html, base_url);
 }
 #endif
 
 }  // namespace ui