Address Ivan's comments.

runtime/lib/growable_array.dart

Index: runtime/lib/growable_array.dart
diff --git a/runtime/lib/growable_array.dart b/runtime/lib/growable_array.dart
index 7929f73fce471f0feca5c1dbfe5147ababfdd492..bda1fc9bd7514e4fd5821689211af6114e398c63 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -172,7 +172,9 @@ class _GrowableObjectArray<T> implements List<T> {
 
   // Collection interface.
 
-  bool contains(T element) => Collections.contains(this, element);
+  bool contains(T element) {
+    return Collections.contains(this, element);
+  }
 
   void forEach(f(T element)) {
     // TODO(srdjan): Use Collections.forEach(this, f);
@@ -182,13 +184,17 @@ class _GrowableObjectArray<T> implements List<T> {
     }
   }
 
-  Iterable mappedBy(f(T element)) => new MappedIterable<T, dynamic>(this, f);
+  Iterable mappedBy(f(T element)) {
+    return new MappedIterable<T, dynamic>(this, f);
+  }
 
   reduce(initialValue, combine(previousValue, T element)) {
     return Collections.reduce(this, initialValue, combine);
   }
 
-  Iterable<T> where(bool f(T element)) => new WhereIterable<T>(this, f);
+  Iterable<T> where(bool f(T element)) {
+    return new WhereIterable<T>(this, f);
+  }
 
   bool every(bool f(T element)) {
     return Collections.every(this, f);
@@ -214,7 +220,9 @@ class _GrowableObjectArray<T> implements List<T> {
     return Collections.collectionToString(this);
   }
 
-  Iterator<T> get iterator => new SequenceIterator<T>(this);
+  Iterator<T> get iterator {
+    return new SequenceIterator<T>(this);
+  }
 
   List<T> toList() {
     return new List<T>.from(this);