Windows fix for exportSyncfsFolderToLocalFs API.

chrome/browser/extensions/api/developer_private/developer_private_api.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 "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include "apps/app_load_service.h"
 #include "apps/app_restore_service.h"
 #include "apps/saved_files_service.h"
 #include "apps/shell_window.h"
@@ skipping 902 matching lines @@
       base::Bind(&DeveloperPrivateExportSyncfsFolderToLocalfsFunction::
                      ClearPrexistingDirectoryContent,
                  this,
                  project_path));
 
   return true;
 }
 
 void DeveloperPrivateExportSyncfsFolderToLocalfsFunction::
     ClearPrexistingDirectoryContent(const base::FilePath& project_path) {
-  if (!base::DeleteFile(project_path, true/*recursive*/)) {
-    SetError("Error in copying files from sync filesystem.");
-    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
-        base::Bind(&DeveloperPrivateExportSyncfsFolderToLocalfsFunction::
-                       SendResponse,
-                   this,
-                   false));
-    return;
-  }
+
+  // Clear the project directory before copying new files.
+  base::DeleteFile(project_path, true/*recursive*/);
 
   pendingCopyOperationsCount_ = 1;
 
   content::BrowserThread::PostTask(content::BrowserThread::IO, FROM_HERE,
       base::Bind(&DeveloperPrivateExportSyncfsFolderToLocalfsFunction::
                  ReadSyncFileSystemDirectory,
                  this, project_path, project_path.BaseName()));
 }
 
 void DeveloperPrivateExportSyncfsFolderToLocalfsFunction::
@@ skipping 306 matching lines @@
 
   #undef   SET_STRING
   return true;
 }
 
 DeveloperPrivateGetStringsFunction::~DeveloperPrivateGetStringsFunction() {}
 
 } // namespace api
 
 } // namespace extensions