kotlin-test: Remove javaClass as is in runtime now

libraries/kotlin.test/shared/src/main/kotlin.jvm/kotlin/test/AsserterLookup.kt

@@ -23,8 +23,7 @@ internal fun lookup(): Asserter {
 
 private fun initContributors() {
     contributors.clear()
-    @Suppress("DEPRECATION")
-    val loader = ServiceLoader.load(AsserterContributor::class.javaClass)
+    val loader = ServiceLoader.load(AsserterContributor::class.java)
 
     for (contributor in loader) {
         if (contributor != null) {

libraries/kotlin.test/shared/src/main/kotlin.jvm/kotlin/test/TestAssertionsJVM.kt

@@ -2,7 +2,6 @@
 @file:kotlin.jvm.JvmName("TestAssertionsKt")
 package kotlin.test
 
-import kotlin.jvm.internal.*
 import kotlin.reflect.*
 
 @Deprecated("Use assertFailsWith instead.", ReplaceWith("assertFailsWith(exceptionClass, block)"), kotlin.DeprecationLevel.ERROR)
@@ -34,14 +33,12 @@ fun <T : Throwable> assertFailsWith(exceptionClass: Class<T>, message: String?,
 fun <T : Throwable> assertFailsWith(exceptionClass: KClass<T>, block: () -> Unit): T = assertFailsWith(exceptionClass, null, block)
 
 /** Asserts that a [block] fails with a specific exception of type [exceptionClass] being thrown. */
-@Suppress("DEPRECATION")
-fun <T : Throwable> assertFailsWith(exceptionClass: KClass<T>, message: String?, block: () -> Unit): T = assertFailsWith(exceptionClass.javaClass, message, block)
+fun <T : Throwable> assertFailsWith(exceptionClass: KClass<T>, message: String?, block: () -> Unit): T = assertFailsWith(exceptionClass.java, message, block)
 
 /** Asserts that a [block] fails with a specific exception of type [T] being thrown.
  *  Since inline method doesn't allow to trace where it was invoked, it is required to pass a [message] to distinguish this method call from others.
  */
-@Suppress("DEPRECATION")
-inline fun <reified T : Throwable> assertFailsWith(message: String, noinline block: () -> Unit): T = assertFailsWith(T::class.javaClass, message, block)
+inline fun <reified T : Throwable> assertFailsWith(message: String, noinline block: () -> Unit): T = assertFailsWith(T::class.java, message, block)
 
 
 /**
@@ -62,12 +59,3 @@ inline fun currentStackTrace() = (java.lang.Exception() as java.lang.Throwable).
 val asserter: Asserter
     get() = lookup()
 
-
-/**
- * Returns a Java [Class] instance corresponding to the given [KClass] instance.
- */
-@Suppress("UNCHECKED_CAST")
-@Intrinsic("kotlin.KClass.java.property")
-@Deprecated("This is for internal use only", ReplaceWith("this.java"), kotlin.DeprecationLevel.WARNING)
-val <T : Any> KClass<T>.javaClass: Class<T>
-    get() = (this as ClassBasedDeclarationContainer).jClass as Class<T>