Unify usage of logging/assert macros in base/

base/sequence_checker.h

Index: base/sequence_checker.h
diff --git a/base/sequence_checker.h b/base/sequence_checker.h
index ad0182825c24805548f05972c7c04e6813688bc7..49c493457cd1d34e73c2789aa83d88851e82c5cf 100644
--- a/base/sequence_checker.h
+++ b/base/sequence_checker.h
@@ -5,13 +5,6 @@
 #ifndef BASE_SEQUENCE_CHECKER_H_
 #define BASE_SEQUENCE_CHECKER_H_
 
-// See comments for the similar block in thread_checker.h.
-#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
-#define ENABLE_SEQUENCE_CHECKER 1
-#else
-#define ENABLE_SEQUENCE_CHECKER 0
-#endif
-
 #include "base/sequence_checker_impl.h"
 
 namespace base {
@@ -47,15 +40,13 @@ class SequenceCheckerDoNothing {
 // }
 //
 // In Release mode, CalledOnValidSequencedThread() will always return true.
-#if ENABLE_SEQUENCE_CHECKER
+#if DCHECK_IS_ON()
 class SequenceChecker : public SequenceCheckerImpl {
 };
 #else
 class SequenceChecker : public SequenceCheckerDoNothing {
 };
-#endif  // ENABLE_SEQUENCE_CHECKER
-
-#undef ENABLE_SEQUENCE_CHECKER
+#endif  // DCHECK_IS_ON()
 
 }  // namespace base