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

base/containers/stack_container.h

Index: base/containers/stack_container.h
diff --git a/base/containers/stack_container.h b/base/containers/stack_container.h
index 9e0efc13b41f428aeedf94efb8ec0c6a3cfb13b1..9a05e466b6f0305460393ebcf457832ae846f415 100644
--- a/base/containers/stack_container.h
+++ b/base/containers/stack_container.h
@@ -57,9 +57,9 @@ class StackAllocator : public std::allocator<T> {
     // The buffer itself. It is not of type T because we don't want the
     // constructors and destructors to be automatically called. Define a POD
     // buffer of the right size instead.
-    base::AlignedMemory<sizeof(T[stack_capacity]), ALIGNOF(T)> stack_buffer_;
+    base::AlignedMemory<sizeof(T[stack_capacity]), alignof(T)> stack_buffer_;
 #if defined(__GNUC__) && !defined(ARCH_CPU_X86_FAMILY)
-    static_assert(ALIGNOF(T) <= 16, "http://crbug.com/115612");
+    static_assert(alignof(T) <= 16, "http://crbug.com/115612");
 #endif
 
     // Set when the stack buffer is used for an allocation. We do not track