[UI] Remove DolphinQt

Source/Core/DolphinQt/Host.h

@@ -1,19 +0,0 @@
-// Copyright 2015 Dolphin Emulator Project
-// Licensed under GPLv2+
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include <QEvent>
-#include <string>
-
-enum HostEvent {
-	TitleEvent = QEvent::User + 1,
-};
-
-class HostTitleEvent final : public QEvent
-{
-public:
-	HostTitleEvent(const std::string& title);
-	const std::string m_title;
-};