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

remoting/client/input_handler.cc

Index: remoting/client/input_handler.cc
diff --git a/remoting/client/input_handler.cc b/remoting/client/input_handler.cc
index 87c3c8994410af49ba33059934bb8a3f7c1d23da..3c8cf0ed24d013323266ad409113f1550c15c7bc 100644
--- a/remoting/client/input_handler.cc
+++ b/remoting/client/input_handler.cc
@@ -10,6 +10,9 @@
 
 namespace remoting {
 
+using protocol::KeyEvent;
+using protocol::MouseEvent;
+
 InputHandler::InputHandler(ClientContext* context,
                            protocol::ConnectionToHost* connection,
                            ChromotingView* view)
@@ -37,7 +40,7 @@ void InputHandler::SendMouseMoveEvent(int x, int y) {
 }
 
 void InputHandler::SendMouseButtonEvent(bool button_down,
-                                        MouseButton button) {
+                                        MouseEvent::MouseButton button) {
   MouseEvent* event = new MouseEvent();
   event->set_button(button);
   event->set_button_down(button_down);