Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

runtime/lib/array.dart

Index: runtime/lib/array.dart
diff --git a/runtime/lib/array.dart b/runtime/lib/array.dart
index 0f10ceb2b541e9a3cbb45015e3080469044183fb..237fdea4c5e236b4a251aba4af80d17cbc4efc86 100644
--- a/runtime/lib/array.dart
+++ b/runtime/lib/array.dart
@@ -13,7 +13,7 @@ class _ObjectArray<E> implements List<E> {
   void operator []=(int index, E value) native "ObjectArray_setIndexed";
 
   String toString() {
-    return Collections.collectionToString(this);
+    return ToString.iterableToString(this);
   }
 
   int get length native "ObjectArray_getLength";
@@ -39,17 +39,6 @@ class _ObjectArray<E> implements List<E> {
         "Cannot remove element of a non-extendable array");
   }
 
-  // Collection interface.
-  void removeAll(Iterable elements) {
-    throw new UnsupportedError(
-        "Cannot remove element of a non-extendable array");
-  }
-
-  void retainAll(Iterable elements) {
-    throw new UnsupportedError(
-        "Cannot remove element of a non-extendable array");
-  }
-
   void removeWhere(bool test(E element)) {
     throw new UnsupportedError(
         "Cannot remove element of a non-extendable array");
@@ -286,16 +275,6 @@ class _ImmutableArray<E> implements List<E> {
         "Cannot modify an immutable array");
   }
 
-  void removeAll(Iterable elements) {
-    throw new UnsupportedError(
-        "Cannot modify an immutable array");
-  }
-
-  void retainAll(Iterable elements) {
-    throw new UnsupportedError(
-        "Cannot modify an immutable array");
-  }
-
   void removeWhere(bool test(E element)) {
     throw new UnsupportedError(
         "Cannot modify an immutable array");
@@ -425,7 +404,7 @@ class _ImmutableArray<E> implements List<E> {
   }
 
   String toString() {
-    return Collections.collectionToString(this);
+    return ToString.iterableToString(this);
   }
 
   int indexOf(E element, [int start = 0]) {