Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/host/continue_window_mac.mm

Index: remoting/host/continue_window_mac.mm
diff --git a/remoting/host/continue_window_mac.mm b/remoting/host/continue_window_mac.mm
index 1dcd458a8bb90ec3bd76d2513d7104f981610596..d61b0fef6f4943e32ca780edaddd0b9218dd8d55 100644
--- a/remoting/host/continue_window_mac.mm
+++ b/remoting/host/continue_window_mac.mm
@@ -55,11 +55,11 @@ ContinueWindowMac::ContinueWindowMac() {
 }
 
 ContinueWindowMac::~ContinueWindowMac() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 }
 
 void ContinueWindowMac::ShowUi() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   base::mac::ScopedNSAutoreleasePool pool;
   controller_.reset(
@@ -68,7 +68,7 @@ void ContinueWindowMac::ShowUi() {
 }
 
 void ContinueWindowMac::HideUi() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   base::mac::ScopedNSAutoreleasePool pool;
   [controller_ hide];