[Remoting Host] Handle text event characters that are not presented on the keyboard

remoting/host/linux/mock_x11_keyboard.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "remoting/protocol/ice_config.h"
+#include "remoting/host/linux/mock_x11_keyboard.h"
 
 namespace remoting {
-namespace protocol {
 
-IceConfig::IceConfig() {}
-IceConfig::IceConfig(const IceConfig& other) = default;
-IceConfig::~IceConfig() {}
+MockX11Keyboard::MockX11Keyboard() {}
 
-}  // namespace protocol
+MockX11Keyboard::~MockX11Keyboard() {}
+
+void MockX11Keyboard::Flush() {}
+
+void MockX11Keyboard::Sync() {}
+
 }  // namespace remoting