[TEST] Migrate AbstractDiagnosticsWithJdk9Test to new test runners

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithJdk9Test.kt

@@ -1,25 +0,0 @@
-/*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.jetbrains.kotlin.checkers
-
-import org.jetbrains.kotlin.test.TestJdkKind
-
-abstract class AbstractDiagnosticsWithJdk9Test : AbstractDiagnosticsTest() {
-
-    override fun getTestJdkKind(files: List<TestFile>): TestJdkKind {
-        return TestJdkKind.FULL_JDK_9
-    }
-}