Require explicit selection of traits for LazyInstance

ui/accessibility/platform/ax_platform_node.cc

Index: ui/accessibility/platform/ax_platform_node.cc
diff --git a/ui/accessibility/platform/ax_platform_node.cc b/ui/accessibility/platform/ax_platform_node.cc
index adfcc1e2ad2f2059b4f9d299242e7378e19fcc0c..dc275a7ccc399e6acd1dcf13f2d5af5e958fe6b0 100644
--- a/ui/accessibility/platform/ax_platform_node.cc
+++ b/ui/accessibility/platform/ax_platform_node.cc
@@ -16,9 +16,8 @@ namespace {
 
 using UniqueIdMap = base::hash_map<int32_t, AXPlatformNode*>;
 // Map from each AXPlatformNode's unique id to its instance.
-base::LazyInstance<UniqueIdMap> g_unique_id_map =
+base::LazyInstance<UniqueIdMap>::DestructorAtExit g_unique_id_map =
     LAZY_INSTANCE_INITIALIZER;
-
 }
 
 #if !defined(PLATFORM_HAS_AX_PLATFORM_NODE_IMPL)