Remove @deprecated features.

pkg/unittest/lib/src/iterable_matchers.dart

Index: pkg/unittest/lib/src/iterable_matchers.dart
diff --git a/pkg/unittest/lib/src/iterable_matchers.dart b/pkg/unittest/lib/src/iterable_matchers.dart
index f0107be7a2b26f77cd51db16dc7fe14fbae99827..dda298905fc1c3856bc8d6d4adcd80691dbedeb7 100644
--- a/pkg/unittest/lib/src/iterable_matchers.dart
+++ b/pkg/unittest/lib/src/iterable_matchers.dart
@@ -58,12 +58,6 @@ class _EveryElement extends _IterableMatcher {
 }
 
 /**
- * Deprecated form of [anyElement].
- */
-@deprecated
-Matcher someElement(matcher) => new _AnyElement(wrapMatcher(matcher));
-
-/**
  * Returns a matcher which matches [Iterable]s in which at least one
  * element matches the given [matcher].
  */
@@ -231,7 +225,7 @@ class _PairwiseCompare extends _IterableMatcher {
     }
     return true;
   }
-    
+
   Description describe(Description description) =>
       description.add('pairwise $_description ').addDescriptionOf(_expected);