chromeos: Destruct DriveResourceMetadata on the blocking pool

chrome/browser/chromeos/drive/drive_test_util.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 CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_TEST_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_TEST_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/drive_resource_metadata.h"
 #include "chrome/browser/chromeos/drive/search_metadata.h"
@@ skipping 151 matching lines @@
 void CopyResultsFromCloseFileCallbackAndQuit(DriveFileError* out_error,
                                              DriveFileError error);
 
 // Loads a test json file as root ("/drive") element from a test file stored
 // under chrome/test/data/chromeos. Returns true on success.
 bool LoadChangeFeed(const std::string& relative_path,
                     ChangeListLoader* change_list_loader,
                     bool is_delta_feed,
                     int64 root_feed_changestamp);
 
-// DriveCache has private destructor, so it is impossible to delete the
-// instance directly. This method delete it correctly.
-void DeleteDriveCache(DriveCache* drive_cache);
+// Helper to destroy objects which needs Destroy() to be called on destruction.
+// Note: When using this helper, you should destruct objects before
+// BrowserThread.
+struct DestroyHelperForTests {
+  template<typename T>
+  void operator()(T* object) const {
+    if (object) {
+      object->Destroy();
+      google_apis::test_util::RunBlockingPoolTask();  // Finish destruction.
+    }
+  }
+};
 
 }  // namespace test_util
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_TEST_UTIL_H_