Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/protocol/stream_channel_factory.h

Index: remoting/protocol/stream_channel_factory.h
diff --git a/remoting/protocol/stream_channel_factory.h b/remoting/protocol/stream_channel_factory.h
index a28b0272beb98f90e95f06b6ab446b29f1aedf85..e078659a6b31ebd19a6e6a261b3eadde6cb2a775 100644
--- a/remoting/protocol/stream_channel_factory.h
+++ b/remoting/protocol/stream_channel_factory.h
@@ -10,14 +10,14 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 
 namespace remoting {
 namespace protocol {
 
 class P2PStreamSocket;
 
-class StreamChannelFactory : public base::NonThreadSafe {
+class StreamChannelFactory {
  public:
   // TODO(sergeyu): Specify connection error code when channel
   // connection fails.
@@ -42,6 +42,8 @@ class StreamChannelFactory : public base::NonThreadSafe {
  protected:
   virtual ~StreamChannelFactory() {}
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(StreamChannelFactory);
 };