Modify ThreadChecker and NonThreadSafe so that their functionality is

base/threading/non_thread_safe.cc

Index: base/threading/non_thread_safe.cc
diff --git a/base/threading/non_thread_safe.cc b/base/threading/non_thread_safe.cc
index 8b41bc0b4b5569f6af03e6988c6dd0e30045edcd..e2e2d2fc87d860d09f06e1ade4edcc61160b7449 100644
--- a/base/threading/non_thread_safe.cc
+++ b/base/threading/non_thread_safe.cc
@@ -4,25 +4,20 @@
 
 #include "base/threading/non_thread_safe.h"
 
-// These checks are only done in debug builds.
-#ifndef NDEBUG
-
 #include "base/logging.h"
 
 namespace base {
 
-NonThreadSafe::~NonThreadSafe() {
+NonThreadSafeImpl::~NonThreadSafeImpl() {
   DCHECK(CalledOnValidThread());
 }
 
-bool NonThreadSafe::CalledOnValidThread() const {
+bool NonThreadSafeImpl::CalledOnValidThread() const {
   return thread_checker_.CalledOnValidThread();
 }
 
-void NonThreadSafe::DetachFromThread() {
+void NonThreadSafeImpl::DetachFromThread() {
   thread_checker_.DetachFromThread();
 }
 
 }  // namespace base
-
-#endif  // NDEBUG