Remove inheritance between LinkedHashSet/Map and HashSet/Map

libraries/stdlib/common/src/kotlin/collections/HashMap.kt

@@ -16,7 +16,7 @@
 
 package kotlin.collections
 
-open expect class HashMap<K, V> : MutableMap<K, V> {
+expect class HashMap<K, V> : MutableMap<K, V> {
     constructor()
     constructor(initialCapacity: Int)
     constructor(initialCapacity: Int, loadFactor: Float)

libraries/stdlib/common/src/kotlin/collections/HashSet.kt

@@ -16,7 +16,7 @@
 
 package kotlin.collections
 
-open expect class HashSet<E> : MutableSet<E> {
+expect class HashSet<E> : MutableSet<E> {
     constructor()
     constructor(initialCapacity: Int)
     constructor(initialCapacity: Int, loadFactor: Float)

libraries/stdlib/common/src/kotlin/collections/LinkedHashMap.kt

@@ -16,9 +16,25 @@
 
 package kotlin.collections
 
-open expect class LinkedHashMap<K, V> : HashMap<K, V> {
+expect class LinkedHashMap<K, V> : MutableMap<K, V> {
     constructor()
     constructor(initialCapacity: Int)
     constructor(initialCapacity: Int, loadFactor: Float)
     constructor(original: Map<out K, V>)
+
+    // From Map
+    override val size: Int
+    override fun isEmpty(): Boolean
+    override fun containsKey(key: K): Boolean
+    override fun containsValue(value: V): Boolean
+    override fun get(key: K): V?
+
+    // From MutableMap
+    override fun put(key: K, value: V): V?
+    override fun remove(key: K): V?
+    override fun putAll(from: Map<out K, V>)
+    override fun clear()
+    override val keys: MutableSet<K>
+    override val values: MutableCollection<V>
+    override val entries: MutableSet<MutableMap.MutableEntry<K, V>>
 }

libraries/stdlib/common/src/kotlin/collections/LinkedHashSet.kt

@@ -16,9 +16,24 @@
 
 package kotlin.collections
 
-open expect class LinkedHashSet<E> : HashSet<E> {
+expect class LinkedHashSet<E> : MutableSet<E> {
     constructor()
     constructor(initialCapacity: Int)
     constructor(initialCapacity: Int, loadFactor: Float)
     constructor(elements: Collection<E>)
+
+    // From Set
+    override val size: Int
+    override fun isEmpty(): Boolean
+    override fun contains(element: @UnsafeVariance E): Boolean
+    override fun containsAll(elements: Collection<@UnsafeVariance E>): Boolean
+
+    // From MutableSet
+    override fun iterator(): MutableIterator<E>
+    override fun add(element: E): Boolean
+    override fun remove(element: E): Boolean
+    override fun addAll(elements: Collection<E>): Boolean
+    override fun removeAll(elements: Collection<E>): Boolean
+    override fun retainAll(elements: Collection<E>): Boolean
+    override fun clear()
 }