Revert "Create IterableMixinWorkaround and move most of the Collections methods there."

tools/dom/templates/immutable_list_mixin.darttemplate

Index: tools/dom/templates/immutable_list_mixin.darttemplate
diff --git a/tools/dom/templates/immutable_list_mixin.darttemplate b/tools/dom/templates/immutable_list_mixin.darttemplate
index 7fb4cee84beb92514936de5492dcac804ae5859d..bf2bf4cc8e7e2708e9928adef5a974f1da0f46d6 100644
--- a/tools/dom/templates/immutable_list_mixin.darttemplate
+++ b/tools/dom/templates/immutable_list_mixin.darttemplate
@@ -15,54 +15,54 @@ $if DEFINE_LENGTH_AS_NUM_ITEMS
   int get length => numberOfItems;
 $endif
   dynamic reduce(dynamic initialValue, dynamic combine(dynamic, $E)) {
-    return IterableMixinWorkaround.reduce(this, initialValue, combine);
+    return Collections.reduce(this, initialValue, combine);
   }
 
 $if DEFINE_CONTAINS
-  bool contains($E element) => IterableMixinWorkaround.contains(this, element);
+  bool contains($E element) => Collections.contains(this, element);
 $else
   // contains() defined by IDL.
 $endif
 
-  void forEach(void f($E element)) => IterableMixinWorkaround.forEach(this, f);
+  void forEach(void f($E element)) => Collections.forEach(this, f);
 
-  String join([String separator]) => IterableMixinWorkaround.joinList(this, separator);
+  String join([String separator]) => Collections.joinList(this, separator);
 
-  List mappedBy(f($E element)) => IterableMixinWorkaround.mappedByList(this, f);
+  List mappedBy(f($E element)) => new MappedList<$E, dynamic>(this, f);
 
-  Iterable<$E> where(bool f($E element)) => IterableMixinWorkaround.where(this, f);
+  Iterable<$E> where(bool f($E element)) => new WhereIterable<$E>(this, f);
 
-  bool every(bool f($E element)) => IterableMixinWorkaround.every(this, f);
+  bool every(bool f($E element)) => Collections.every(this, f);
 
-  bool any(bool f($E element)) => IterableMixinWorkaround.any(this, f);
+  bool any(bool f($E element)) => Collections.any(this, f);
 
   List<$E> toList() => new List<$E>.from(this);
   Set<$E> toSet() => new Set<$E>.from(this);
 
   bool get isEmpty => this.length == 0;
 
-  List<$E> take(int n) => IterableMixinWorkaround.takeList(this, n);
+  List<$E> take(int n) => new ListView<$E>(this, 0, n);
 
   Iterable<$E> takeWhile(bool test($E value)) {
-    return IterableMixinWorkaround.takeWhile(this, test);
+    return new TakeWhileIterable<$E>(this, test);
   }
 
-  List<$E> skip(int n) => IterableMixinWorkaround.skipList(this, n);
+  List<$E> skip(int n) => new ListView<$E>(this, n, null);
 
   Iterable<$E> skipWhile(bool test($E value)) {
-    return IterableMixinWorkaround.skipWhile(this, test);
+    return new SkipWhileIterable<$E>(this, test);
   }
 
   $E firstMatching(bool test($E value), { $E orElse() }) {
-    return IterableMixinWorkaround.firstMatching(this, test, orElse);
+    return Collections.firstMatching(this, test, orElse);
   }
 
   $E lastMatching(bool test($E value), {$E orElse()}) {
-    return IterableMixinWorkaround.lastMatchingInList(this, test, orElse);
+    return Collections.lastMatchingInList(this, test, orElse);
   }
 
   $E singleMatching(bool test($E value)) {
-    return IterableMixinWorkaround.singleMatching(this, test);
+    return Collections.singleMatching(this, test);
   }
 
   $E elementAt(int index) {
@@ -126,9 +126,9 @@ $endif
     throw new StateError("More than one element");
   }
 
-  $E min([int compare($E a, $E b)]) => IterableMixinWorkaround.min(this, compare);
+  $E min([int compare($E a, $E b)]) => Collections.min(this, compare);
 
-  $E max([int compare($E a, $E b)]) => IterableMixinWorkaround.max(this, compare);
+  $E max([int compare($E a, $E b)]) => Collections.max(this, compare);
 
   $E removeAt(int pos) {
     throw new UnsupportedError("Cannot removeAt on immutable List.");