From 1e0683735e26c6fcecb0977e0cdae5da2eaf7c84 Mon Sep 17 00:00:00 2001
From: Jose Dapena Paz <jdapena@igalia.com>
Date: Tue, 22 Sep 2020 13:18:55 +0200
Subject: [PATCH] libstdc++: use max_align_t without std prefix in partition alloc constants.

Using std::max_align_t would require using cstddef instead of stddef.h. As
partition alloc constants is including stddef.h, let's remove the std::
namespace prefix.

This fixes this error building with libstdc++
../../base/allocator/partition_allocator/partition_alloc_constants.h:200:51: error: ‘max_align_t’ is not a member of ‘std’; did you mean ‘max_align_t’?

Bug: 957519
Change-Id: I72b22428937e7b7b1e6bb31fb0ac0bef3b72c581

(Adjusted to work with clang too)
---

diff --git a/base/allocator/partition_allocator/partition_alloc_constants.h b/base/allocator/partition_allocator/partition_alloc_constants.h
index 0c74dbe..ef1488f 100644
--- a/base/allocator/partition_allocator/partition_alloc_constants.h
+++ b/base/allocator/partition_allocator/partition_alloc_constants.h
@@ -183,7 +183,7 @@ NumPartitionPagesPerSuperPage() {
 }
 
 // Alignment has two constraints:
-// - Alignment requirement for scalar types: alignof(std::max_align_t)
+// - Alignment requirement for scalar types: alignof(max_align_t)
 // - Alignment requirement for operator new().
 //
 // The two are separate on Windows 64 bits, where the first one is 8 bytes, and
@@ -195,9 +195,9 @@ NumPartitionPagesPerSuperPage() {
 // platforms, as Chrome's requirement is C++14 as of 2020.
 #if defined(__STDCPP_DEFAULT_NEW_ALIGNMENT__)
 static constexpr size_t kAlignment =
-    std::max(alignof(std::max_align_t), __STDCPP_DEFAULT_NEW_ALIGNMENT__);
+    std::max(alignof(max_align_t), __STDCPP_DEFAULT_NEW_ALIGNMENT__);
 #else
-static constexpr size_t kAlignment = alignof(std::max_align_t);
+static constexpr size_t kAlignment = alignof(max_align_t);
 #endif
 static_assert(kAlignment <= 16,
               "PartitionAlloc doesn't support a fundamental alignment larger "