Enable the -Wundef warning for clang

webrtc/base/sequenced_task_checker_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/test/gtest.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/platform_thread.h"
 #include "webrtc/base/sequenced_task_checker.h"
 #include "webrtc/base/task_queue.h"
 
 namespace rtc {
 
 namespace {
 // Calls SequencedTaskChecker::CalledSequentially on another thread.
@@ skipping 169 matching lines @@
         new SequencedTaskChecker());
 
     sequenced_task_checker->Detach();
     CallCalledSequentiallyOnThread call_on_thread(true,
                                                   sequenced_task_checker.get());
     done_event.Set();
   });
   EXPECT_TRUE(done_event.Wait(1000));
 }
 
-#if !NDEBUG || DCHECK_ALWAYS_ON
+#if !defined(NDEBUG) || DCHECK_ALWAYS_ON
 TEST(SequencedTaskCheckerTest, MethodNotAllowedOnDifferentThreadInDebug) {
   RunMethodOnDifferentThread(false);
 }
 #else
 TEST(SequencedTaskCheckerTest, MethodAllowedOnDifferentThreadInRelease) {
   RunMethodOnDifferentThread(true);
 }
 #endif
 
-#if !NDEBUG || DCHECK_ALWAYS_ON
+#if !defined(NDEBUG) || DCHECK_ALWAYS_ON
 TEST(SequencedTaskCheckerTest, MethodNotAllowedOnDifferentTaskQueueInDebug) {
   RunMethodOnDifferentTaskQueue(false);
 }
 #else
 TEST(SequencedTaskCheckerTest, MethodAllowedOnDifferentTaskQueueInRelease) {
   RunMethodOnDifferentTaskQueue(true);
 }
 #endif
 
-#if !NDEBUG || DCHECK_ALWAYS_ON
+#if !defined(NDEBUG) || DCHECK_ALWAYS_ON
 TEST(SequencedTaskCheckerTest, DetachFromTaskQueueInDebug) {
   DetachThenCallFromDifferentTaskQueue(false);
 }
 #else
 TEST(SequencedTaskCheckerTest, DetachFromTaskQueueInRelease) {
   DetachThenCallFromDifferentTaskQueue(true);
 }
 #endif
 
 class TestAnnotations {
@@ skipping 33 matching lines @@
 TEST(SequencedTaskCheckerTest, TestAnnotationsOnWrongQueueDebug) {
   ASSERT_DEATH({ TestAnnotationsOnWrongQueue(); }, "");
 }
 #else
 TEST(SequencedTaskCheckerTest, TestAnnotationsOnWrongQueueRelease) {
   TestAnnotationsOnWrongQueue();
 }
 #endif
 #endif  // GTEST_HAS_DEATH_TEST
 }  // namespace rtc