JS: Remove LinkedList declaration since the implementation is missing.

#KT-7480 Fixed

js/js.libraries/src/core/javautil.kt

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2010-2016 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 java.util
 
 @native
@@ -68,17 +84,6 @@ public open class ArrayList<E>(capacity: Int = 0) : AbstractList<E>() {
     override val size: Int get() = noImpl
 }
 
-@library
-public open class LinkedList<E>() : AbstractList<E>() {
-    override fun get(index: Int): E = noImpl
-    override fun set(index: Int, element: E): E = noImpl
-    override fun add(index: Int, element: E): Unit = noImpl
-
-    public fun poll(): E? = noImpl
-    public fun peek(): E? = noImpl
-    public fun offer(e: E): Boolean = noImpl
-}
-
 @library
 public open class HashSet<E>(
         initialCapacity: Int = DEFAULT_INITIAL_CAPACITY, loadFactor: Float = DEFAULT_LOAD_FACTOR