[SyncFS] Use nullptr instead of NULL

chrome/browser/sync_file_system/sync_process_runner_unittest.cc

 // Copyright 2014 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/sync_file_system/sync_process_runner.h"
 
 #include <queue>
 
 #include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace sync_file_system {
 
 namespace {
 
 class FakeClient : public SyncProcessRunner::Client {
  public:
   FakeClient() : service_state_(SYNC_SERVICE_RUNNING) {}
   virtual ~FakeClient() {}
 
   virtual SyncServiceState GetSyncServiceState() OVERRIDE {
     return service_state_;
   }
 
   virtual SyncFileSystemService* GetSyncService() OVERRIDE {
-    return NULL;
+    return nullptr;
   }
 
   void set_service_state(SyncServiceState service_state) {
     service_state_ = service_state;
   }
 
  private:
   SyncServiceState service_state_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeClient);
@@ skipping 231 matching lines @@
 
   // Then, following failing task should not extend throttling period.
   fake_timer->AdvanceToScheduledTime();
   fake_client.set_service_state(SYNC_SERVICE_TEMPORARY_UNAVAILABLE);
   fake_runner.CompleteTask(SYNC_STATUS_FAILED);
   EXPECT_EQ(SyncProcessRunner::kSyncDelaySlowInMilliseconds,
             fake_timer->GetCurrentDelay());
 }
 
 }  // namespace sync_file_system