[SyncFS] Use nullptr instead of NULL

chrome/browser/sync_file_system/local/syncable_file_operation_runner_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 <string>
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
@@ skipping 66 matching lines @@
         file_system_.MaybeInitializeFileSystemContext(sync_context_.get()));
 
     ASSERT_EQ(File::FILE_OK, file_system_.OpenFileSystem());
     ASSERT_EQ(File::FILE_OK,
               file_system_.CreateDirectory(URL(kParent)));
   }
 
   virtual void TearDown() OVERRIDE {
     if (sync_context_.get())
       sync_context_->ShutdownOnUIThread();
-    sync_context_ = NULL;
+    sync_context_ = nullptr;
 
     file_system_.TearDown();
     RevokeSyncableFileSystem();
   }
 
   FileSystemURL URL(const std::string& path) {
     return file_system_.URL(path);
   }
 
   LocalFileSyncStatus* sync_status() {
@@ skipping 241 matching lines @@
   file_system_.operation_runner()->Truncate(
       URL(kFile), 1,
       ExpectStatus(FROM_HERE, File::FILE_ERROR_ABORT));
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(0, callback_count_);
 
   ResetCallbackStatus();
 
   // This shouldn't crash nor leak memory.
   sync_context_->ShutdownOnUIThread();
-  sync_context_ = NULL;
+  sync_context_ = nullptr;
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(2, callback_count_);
 }
 
 // Test if CopyInForeignFile runs cooperatively with other Sync operations.
 TEST_F(SyncableFileOperationRunnerTest, CopyInForeignFile) {
   const std::string kTestData("test data");
 
   base::FilePath temp_path;
   ASSERT_TRUE(CreateTempFile(&temp_path));
@@ skipping 42 matching lines @@
   storage::FileSystemOperationRunner::OperationID id =
       file_system_.operation_runner()->Truncate(
           URL(kFile), 10, ExpectStatus(FROM_HERE, File::FILE_OK));
   file_system_.operation_runner()->Cancel(
       id, ExpectStatus(FROM_HERE, File::FILE_ERROR_INVALID_OPERATION));
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(2, callback_count_);
 }
 
 }  // namespace sync_file_system