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

cc/base/contiguous_container.h

Index: cc/base/contiguous_container.h
diff --git a/cc/base/contiguous_container.h b/cc/base/contiguous_container.h
index d0285fcf8f00f4720f236f51c61d7d2e8b2ab4b7..ea5d8e65e5407f942576468e9d11dae1e572cc8c 100644
--- a/cc/base/contiguous_container.h
+++ b/cc/base/contiguous_container.h
@@ -169,7 +169,7 @@ class ContiguousContainer : public ContiguousContainerBase {
 
   template <class DerivedElementType, typename... Args>
   DerivedElementType& AllocateAndConstruct(Args&&... args) {
-    static_assert(alignment % ALIGNOF(DerivedElementType) == 0,
+    static_assert(alignment % alignof(DerivedElementType) == 0,
                   "Derived type requires stronger alignment.");
     return *new (AlignedAllocate(sizeof(DerivedElementType)))
         DerivedElementType(std::forward<Args>(args)...);