Generating remove() for Iterator using same mechanism.

compiler/testData/codegen/box/builtinStubMethods/Iterator.kt

@@ -0,0 +1,13 @@
+class MyIterator<T>(val v: T): Iterator<T> {
+    override fun next(): T = v
+    override fun hasNext(): Boolean = true
+}
+
+fun box(): String {
+    try {
+        (MyIterator<String>("") as MutableIterator<String>).remove()
+        throw AssertionError()
+    } catch (e: UnsupportedOperationException) {
+        return "OK"
+    }
+}

compiler/testData/codegen/boxWithJava/functions/removeInIterator.java

@@ -1,5 +0,0 @@
-public class removeInIterator {
-    public static void bar(java.util.Iterator<Integer> it) {
-        it.remove();
-    }
-}

compiler/testData/codegen/boxWithJava/functions/removeInIterator.kt

@@ -1,13 +0,0 @@
-fun box() : String {
-    try {
-        removeInIterator.bar(object : Iterator<Int> {
-            public override fun hasNext(): Boolean = false
-            public override fun next(): Int = 1
-        })
-    }
-    catch (e: UnsupportedOperationException) {
-        if (e.getMessage() == "Mutating method called on a Kotlin Iterator")
-            return "OK"
-    }
-    return "fail"
-}