Remove hacks introduced for 172 platform compatibility

idea/idea-core/src/org/jetbrains/kotlin/idea/core/util/compat/psi/javaPsiUtil.kt

@@ -1,18 +0,0 @@
-/*
- * Copyright 2010-2018 JetBrains s.r.o. 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.core.util.compat.psi
-
-import com.intellij.psi.PsiMethod
-import com.intellij.psi.util.PsiUtil
-
-/**
- * Method is absent in 172.
- * BUNCH: 173
- */
-@Suppress("IncompatibleAPI")
-fun canBeOverridden(method: PsiMethod): Boolean {
-    return PsiUtil.canBeOverridden(method)
-}