Migrated test block 26 to Dart 2.0.

tests/corelib_2/splay_tree_from_iterable_test.dart

Index: tests/corelib_2/splay_tree_from_iterable_test.dart
diff --git a/tests/corelib_strong/splay_tree_from_iterable_test.dart b/tests/corelib_2/splay_tree_from_iterable_test.dart
similarity index 98%
rename from tests/corelib_strong/splay_tree_from_iterable_test.dart
rename to tests/corelib_2/splay_tree_from_iterable_test.dart
index 97a8732c30fc18d3ee99151712dff4f05517903f..08ceba37b913111a239e88c77df776d4ff9f8cd7 100644
--- a/tests/corelib_strong/splay_tree_from_iterable_test.dart
+++ b/tests/corelib_2/splay_tree_from_iterable_test.dart
@@ -124,10 +124,6 @@ typedef bool intToBool(int v);
 
 // Test in checked mode with explicitly given types.
 void typedTest() {
-  bool isCheckedMode = false;
-  assert((isCheckedMode = true));
-  if (!isCheckedMode) return;
-
   // Assign functions to typed function variables.
   intToString key = (int v) => "$v";
   intToBool value = (int v) => v.isOdd;