Make kAllowedToAccessOnNonjoinableThread debug-only.

base/lazy_instance.h

Index: base/lazy_instance.h
diff --git a/base/lazy_instance.h b/base/lazy_instance.h
index 3935780a55b7352ba78611944b48fa3cfce15d14..05a7c5d81eccb0291706ae8e29c32aac8a9acd65 100644
--- a/base/lazy_instance.h
+++ b/base/lazy_instance.h
@@ -57,7 +57,9 @@ namespace base {
 template <typename Type>
 struct DefaultLazyInstanceTraits {
   static const bool kRegisterOnExit = true;
+#ifndef NDEBUG
   static const bool kAllowedToAccessOnNonjoinableThread = false;
+#endif
 
   static Type* New(void* instance) {
     DCHECK_EQ(reinterpret_cast<uintptr_t>(instance) & (ALIGNOF(Type) - 1), 0u)
@@ -89,7 +91,9 @@ namespace internal {
 template <typename Type>
 struct LeakyLazyInstanceTraits {
   static const bool kRegisterOnExit = false;
+#ifndef NDEBUG
   static const bool kAllowedToAccessOnNonjoinableThread = true;
+#endif
 
   static Type* New(void* instance) {
     ANNOTATE_SCOPED_MEMORY_LEAK;