Move move classes to the remoting::protocol namespace. Minor cleanups.

remoting/protocol/message_decoder.h

Index: remoting/protocol/message_decoder.h
diff --git a/remoting/protocol/message_decoder.h b/remoting/protocol/message_decoder.h
index d2ba80aa0c0368aa6952c744a627642a242c19b2..8b521fe6a1144f0785f20cbacf98b6547b438f80 100644
--- a/remoting/protocol/message_decoder.h
+++ b/remoting/protocol/message_decoder.h
@@ -15,6 +15,7 @@
 #include "third_party/protobuf/src/google/protobuf/message_lite.h"
 
 namespace remoting {
+namespace protocol {
 
 // MessageDecoder uses CompoundBuffer to decode bytes into protocol
 // buffer messages. This can be used to decode bytes received from the
@@ -87,6 +88,7 @@ class MessageDecoder {
   bool next_payload_known_;
 };
 
+}  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_MESSAGES_DECODER_H_