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

base/metrics/persistent_memory_allocator.h

Index: base/metrics/persistent_memory_allocator.h
diff --git a/base/metrics/persistent_memory_allocator.h b/base/metrics/persistent_memory_allocator.h
index 7fd96a4405be28616bd64f4aba49b96390e87e94..5a2e0906ef1c83bcadd45e171b460b6dec135429 100644
--- a/base/metrics/persistent_memory_allocator.h
+++ b/base/metrics/persistent_memory_allocator.h
@@ -471,7 +471,7 @@ class BASE_EXPORT PersistentMemoryAllocator {
         const_cast<void*>(GetBlockData(ref, T::kPersistentTypeId, size));
     if (!mem)
       return nullptr;
-    DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(mem) & (ALIGNOF(T) - 1));
+    DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(mem) & (alignof(T) - 1));
     return new (mem) T();
   }
   template <typename T>
@@ -499,7 +499,7 @@ class BASE_EXPORT PersistentMemoryAllocator {
       return nullptr;
     // Ensure the allocator's internal alignment is sufficient for this object.
     // This protects against coding errors in the allocator.
-    DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(mem) & (ALIGNOF(T) - 1));
+    DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(mem) & (alignof(T) - 1));
     // Change the type, clearing the memory if so desired. The new type is
     // "transitioning" so that there is no race condition with the construction
     // of the object should another thread be simultaneously iterating over