PluginStartupListener clean up

Relates to #KT-39968

idea/src/org/jetbrains/kotlin/idea/PluginStartupListener.kt

@@ -10,6 +10,11 @@ import com.intellij.openapi.application.PathMacros
 import org.jetbrains.kotlin.idea.util.application.isUnitTestMode
 import org.jetbrains.kotlin.utils.PathUtil.kotlinPathsForIdeaPlugin
 
+/**
+ * Some actions have to be performed before loading and opening any project.
+ *
+ * E.g. path variables have to be registered in advance as modules could rely on some path variables.
+ */
 class PluginStartupListener : ApplicationInitializedListener {
 
     override fun componentsInitialized() {

idea/src/org/jetbrains/kotlin/idea/PluginStartupListener.kt.192

@@ -1,9 +0,0 @@
-/*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.idea
-
-class PluginStartupListener {
-}