description: gcc 6 does not provide a typedef for atomic<uint32_t>
author: Michael Gilbert <mgilbert@debian.org>

--- a/third_party/blink/renderer/platform/heap/gc_info.cc
+++ b/third_party/blink/renderer/platform/heap/gc_info.cc
@@ -51,7 +51,7 @@ void GCInfoTable::CreateGlobalTable() {
 
 uint32_t GCInfoTable::EnsureGCInfoIndex(
     const GCInfo* gc_info,
-    std::atomic_uint32_t* gc_info_index_slot) {
+    std::atomic<uint32_t>* gc_info_index_slot) {
   DCHECK(gc_info);
   DCHECK(gc_info_index_slot);
 
--- a/third_party/blink/renderer/platform/heap/gc_info.h
+++ b/third_party/blink/renderer/platform/heap/gc_info.h
@@ -72,7 +72,7 @@ class PLATFORM_EXPORT GCInfoTable {
     return info;
   }
 
-  uint32_t EnsureGCInfoIndex(const GCInfo*, std::atomic_uint32_t*);
+  uint32_t EnsureGCInfoIndex(const GCInfo*, std::atomic<uint32_t>*);
 
   uint32_t GcInfoIndex() { return current_index_; }
 
@@ -117,7 +117,7 @@ struct GCInfoAtBaseType {
     };
     // This is more complicated than using threadsafe initialization, but this
     // is instantiated many times (once for every GC type).
-    static std::atomic_uint32_t gc_info_index{0};
+    static std::atomic<uint32_t> gc_info_index{0};
     uint32_t index = gc_info_index.load(std::memory_order_acquire);
     if (!index)
       index = GCInfoTable::Get().EnsureGCInfoIndex(&kGcInfo, &gc_info_index);