Remove base's ALIGNOF/ALIGNAS in favor of alignof/alignas.

base/memory/singleton.h

Index: base/memory/singleton.h
diff --git a/base/memory/singleton.h b/base/memory/singleton.h
index cfdff7831f9f7b5a4ad1be5aa955f33d73112641..6f9598f36c9dd444024015ab2f6e33f1434244a1 100644
--- a/base/memory/singleton.h
+++ b/base/memory/singleton.h
@@ -130,13 +130,13 @@ struct StaticMemorySingletonTraits {
   static void Resurrect() { subtle::NoBarrier_Store(&dead_, 0); }
 
  private:
-  static AlignedMemory<sizeof(Type), ALIGNOF(Type)> buffer_;
+  static AlignedMemory<sizeof(Type), alignof(Type)> buffer_;
   // Signal the object was already deleted, so it is not revived.
   static subtle::Atomic32 dead_;
 };
 
 template <typename Type>
-AlignedMemory<sizeof(Type), ALIGNOF(Type)>
+AlignedMemory<sizeof(Type), alignof(Type)>
     StaticMemorySingletonTraits<Type>::buffer_;
 template <typename Type>
 subtle::Atomic32 StaticMemorySingletonTraits<Type>::dead_ = 0;