Remove deprecated mappedBy.

Committed: https://code.google.com/p/dart/source/detail?r=18575
Reverted: http://code.google.com/p/dart/source/detail?r=18576

Review URL: https://codereview.chromium.org//12212213

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18579 260f80e4-7a28-3924-810f-c04153c831b5

utils/template/utils.dart

@@ -7,7 +7,7 @@
 
 // TODO(jmesserly): we might want a version of this that return an iterable,
 // however JS, Python and Ruby versions are all eager.
-List mappedBy(Iterable source, mapper(source)) {
+List map(Iterable source, mapper(source)) {
   List result = new List();
   if (source is List) {
     List list = source; // TODO: shouldn't need this