Add MoveOperationTest for drive::file_system::MoveOperationTest.

chrome/browser/chromeos/drive/file_system/create_file_operation_unittest.cc

 // Copyright 2013 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/chromeos/drive/file_system/create_file_operation.h"
 
 #include "chrome/browser/chromeos/drive/file_system/operation_test_base.h"
 #include "chrome/browser/google_apis/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 namespace file_system {
 
 typedef OperationTestBase CreateFileOperationTest;
 
 TEST_F(CreateFileOperationTest, CreateFile) {
   CreateFileOperation operation(blocking_task_runner(),
-                                dummy_observer(),
+                                observer(),
                                 scheduler(),
                                 metadata(),
                                 cache());
 
   const base::FilePath kExistingFile(
       FILE_PATH_LITERAL("drive/root/File 1.txt"));
   const base::FilePath kExistingDirectory(
       FILE_PATH_LITERAL("drive/root/Directory 1"));
   const base::FilePath kNonExistingFile(
       FILE_PATH_LITERAL("drive/root/Directory 1/not exist.png"));
@@ skipping 37 matching lines @@
   operation.CreateFile(
       kFileInNonExistingDirectory,
       false,  // is_exclusive
       google_apis::test_util::CreateCopyResultCallback(&error));
   google_apis::test_util::RunBlockingPoolTask();
   EXPECT_EQ(FILE_ERROR_NOT_A_DIRECTORY, error);
 }
 
 }  // namespace file_system
 }  // namespace drive