Drop previously deprecated API

- common and JS org.junit.Test from kotlin.test
- kotlin.Synchronized/Volatile from K/JS
- JS 'native' annotation

libraries/stdlib/js/src/kotlin/annotations.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -7,10 +7,6 @@ package kotlin.js
 
 import kotlin.annotation.AnnotationTarget.*
 
-@Target(CLASS, FUNCTION, PROPERTY, CONSTRUCTOR, VALUE_PARAMETER, PROPERTY_GETTER, PROPERTY_SETTER)
-@Deprecated("Use `external` modifier instead", level = DeprecationLevel.ERROR)
-public annotation class native(public val name: String = "")
-
 @Target(FUNCTION)
 @Deprecated("Use inline extension function with body using dynamic")
 public annotation class nativeGetter

libraries/stdlib/js/src/kotlin/concurrent.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -8,12 +8,6 @@ package kotlin
 import kotlin.contracts.*
 
 
-@Deprecated("Do not use Synchronized annotation in pure Kotlin/JS code", level = DeprecationLevel.ERROR)
-public typealias Synchronized = kotlin.jvm.Synchronized
-
-@Deprecated("Do not use Volatile annotation in pure Kotlin/JS code", level = DeprecationLevel.ERROR)
-public typealias Volatile = kotlin.jvm.Volatile
-
 @kotlin.internal.InlineOnly
 public actual inline fun <R> synchronized(lock: Any, block: () -> R): R {
     contract {