Deprecate NonThreadSafe in net/ in favor of SequenceChecker/ThreadChecker.

net/url_request/url_request_throttler_manager.cc

Index: net/url_request/url_request_throttler_manager.cc
diff --git a/net/url_request/url_request_throttler_manager.cc b/net/url_request/url_request_throttler_manager.cc
index 12382671e56e9a952fc9ce1489336e86f1956515..4ceec8543169c6653b59361d2b1f23582cc19ac7 100644
--- a/net/url_request/url_request_throttler_manager.cc
+++ b/net/url_request/url_request_throttler_manager.cc
@@ -31,6 +31,7 @@ URLRequestThrottlerManager::URLRequestThrottlerManager()
 }
 
 URLRequestThrottlerManager::~URLRequestThrottlerManager() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   NetworkChangeNotifier::RemoveIPAddressObserver(this);
   NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 
@@ -50,7 +51,9 @@ URLRequestThrottlerManager::~URLRequestThrottlerManager() {
 
 scoped_refptr<URLRequestThrottlerEntryInterface>
     URLRequestThrottlerManager::RegisterRequestUrl(const GURL &url) {
-  DCHECK(!enable_thread_checks_ || CalledOnValidThread());
+#if DCHECK_IS_ON()
+  DCHECK(!enable_thread_checks_ || sequence_checker_.CalledOnValidSequence());
+#endif  // DCHECK_IS_ON()
 
   // Normalize the url.
   std::string url_id = GetIdFromUrl(url);