- Fix for issue 27054 (leak when removing element from _GrowableList)

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 271c71a12264d2c0928dbe82dc9a3ef853725ec1..9e942e4c5fc112a08194f5667345a3faf1456fd6 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -112,8 +112,19 @@ class _GrowableList<T> extends ListBase<T> {
   int get length native "GrowableList_getLength";
 
   void set length(int new_length) {
-    int new_capacity = (new_length == 0) ? _kDefaultCapacity : new_length;
-    if (new_capacity > _capacity) {
+    int old_capacity = _capacity;
+    int new_capacity = new_length;
+    if (new_length == 0) {
+      // Ensure that we use _kDefaultCapacity only when the old_capacity
+      // is greater than _kDefaultCapacity otherwise we end up growing the
+      // the array.
+      if (old_capacity < _kDefaultCapacity) {
+        new_capacity = old_capacity;
+      } else {
+        new_capacity = _kDefaultCapacity;
+      }
+    }
+    if (new_capacity > old_capacity) {
       _grow(new_capacity);
       _setLength(new_length);
       return;
@@ -203,8 +214,7 @@ class _GrowableList<T> extends ListBase<T> {
   T removeLast() {
     var len = length - 1;
     var elem = this[len];
-    this[len] = null;
-    _setLength(len);
+    this.length = len;
     return elem;
   }