Don't allow multiple opens for Pepper FileSystem.

ppapi/tests/test_file_ref.cc

 // Copyright (c) 2010 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 "ppapi/tests/test_file_ref.h"
 
 #include <stdio.h>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/dev/ppb_file_io_dev.h"
@@ skipping 236 matching lines @@
   TestCompletionCallback callback(instance_->pp_instance());
 
   // Open.
   pp::FileSystem_Dev file_system(instance_, PP_FILESYSTEMTYPE_LOCALTEMPORARY);
   int32_t rv = file_system.Open(1024, callback);
   if (rv == PP_ERROR_WOULDBLOCK)
     rv = callback.WaitForResult();
   if (rv != PP_OK)
     return ReportError("FileSystem::Open", rv);
 
-  // Open aborted (see the DirectoryReader test for comments).
-  callback.reset_run_count();
-  rv = pp::FileSystem_Dev(instance_, PP_FILESYSTEMTYPE_LOCALTEMPORARY)
-      .Open(1024, callback);
-  if (callback.run_count() > 0)
-    return "FileSystem::Open ran callback synchronously.";
-  if (rv == PP_ERROR_WOULDBLOCK) {
-    rv = callback.WaitForResult();
-    if (rv != PP_ERROR_ABORTED)
-      return "FileSystem::Open not aborted.";
-  } else if (rv != PP_OK) {
-    return ReportError("FileSystem::Open", rv);
-  }
-
   // MakeDirectory.
   pp::FileRef_Dev dir_ref(file_system, "/test_dir_make_directory");
   rv = dir_ref.MakeDirectory(callback);
   if (rv == PP_ERROR_WOULDBLOCK)
     rv = callback.WaitForResult();
   if (rv != PP_OK)
     return ReportError("FileSystem::MakeDirectory", rv);
 
   // MakeDirectory aborted.
   callback.reset_run_count();
@@ skipping 289 matching lines @@
   if (rv == PP_ERROR_WOULDBLOCK) {
     rv = callback.WaitForResult();
     if (rv != PP_ERROR_ABORTED)
       return "FileSystem::Rename not aborted.";
   } else if (rv != PP_OK) {
     return ReportError("FileSystem::Rename", rv);
   }
 
   PASS();
 }