Remove named function literals from library and tests

sdk/lib/core/set.dart

Index: sdk/lib/core/set.dart
===================================================================
--- sdk/lib/core/set.dart	(revision 14804)
+++ sdk/lib/core/set.dart	(working copy)
@@ -110,14 +110,14 @@
   }
 
   void addAll(Collection<E> collection) {
-    collection.forEach(void _(E value) {
+    collection.forEach((E value) {
       add(value);
     });
   }
 
   Set<E> intersection(Collection<E> collection) {
     Set<E> result = new Set<E>();
-    collection.forEach(void _(E value) {
+    collection.forEach((E value) {
       if (contains(value)) result.add(value);
     });
     return result;
@@ -128,26 +128,26 @@
   }
 
   void removeAll(Collection<E> collection) {
-    collection.forEach(void _(E value) {
+    collection.forEach((E value) {
       remove(value);
     });
   }
 
   bool containsAll(Collection<E> collection) {
-    return collection.every(bool _(E value) {
+    return collection.every((E value) {
       return contains(value);
     });
   }
 
   void forEach(void f(E element)) {
-    _backingMap.forEach(void _(E key, E value) {
+    _backingMap.forEach((E key, E value) {
       f(key);
     });
   }
 
   Set map(f(E element)) {
     Set result = new Set();
-    _backingMap.forEach(void _(E key, E value) {
+    _backingMap.forEach((E key, E value) {
       result.add(f(key));
     });
     return result;
@@ -160,7 +160,7 @@
 
   Set<E> filter(bool f(E element)) {
     Set<E> result = new Set<E>();
-    _backingMap.forEach(void _(E key, E value) {
+    _backingMap.forEach((E key, E value) {
       if (f(key)) result.add(key);
     });
     return result;