Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/protocol/ssl_hmac_channel_authenticator.h

Index: remoting/protocol/ssl_hmac_channel_authenticator.h
diff --git a/remoting/protocol/ssl_hmac_channel_authenticator.h b/remoting/protocol/ssl_hmac_channel_authenticator.h
index c76341c84f1550037098f0c855a9cd7565531e85..462aaea5e0dd8a84d1024e52e21d98d996f70cda 100644
--- a/remoting/protocol/ssl_hmac_channel_authenticator.h
+++ b/remoting/protocol/ssl_hmac_channel_authenticator.h
@@ -11,7 +11,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "remoting/protocol/channel_authenticator.h"
 
 namespace net {
@@ -34,8 +34,7 @@ namespace protocol {
 // SslHmacChannelAuthenticator implements ChannelAuthenticator that
 // secures channels using SSL and authenticates them with a shared
 // secret HMAC.
-class SslHmacChannelAuthenticator : public ChannelAuthenticator,
-                                    public base::NonThreadSafe {
+class SslHmacChannelAuthenticator : public ChannelAuthenticator {
  public:
   enum LegacyMode {
     NONE,
@@ -104,6 +103,8 @@ class SslHmacChannelAuthenticator : public ChannelAuthenticator,
   scoped_refptr<net::DrainableIOBuffer> auth_write_buf_;
   scoped_refptr<net::GrowableIOBuffer> auth_read_buf_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(SslHmacChannelAuthenticator);
 };