Migrated test block 12 to Dart 2.0.

tests/corelib/corelib.status

Index: tests/corelib/corelib.status
diff --git a/tests/corelib/corelib.status b/tests/corelib/corelib.status
index 98144dff618586225b9028069e3ba1ff13095461..8a85a2316e0bc318512e96cae5b6e4a4e30341ad 100644
--- a/tests/corelib/corelib.status
+++ b/tests/corelib/corelib.status
@@ -27,7 +27,6 @@ error_stack_trace1_test: RuntimeError # Issue 12399
 integer_to_string_test/01: RuntimeError # Issue 1533
 iterable_return_type_test/01: RuntimeError # Issue 20085
 iterable_return_type_test/02: RuntimeError # Dart2js does not support Uint64*.
-iterable_to_list_test/01: RuntimeError # Issue 26501
 
 big_integer_*: Skip # VM specific test.
 compare_to2_test: RuntimeError, OK    # Requires bigint support.
@@ -155,15 +154,6 @@ iterable_return_type_test/none: Crash
 iterable_single_test: Crash
 iterable_single_where_test: Crash
 iterable_skip_test: Crash
-iterable_skip_while_test: Crash
-iterable_take_test: Crash
-iterable_take_while_test: Crash
-iterable_test: Crash
-iterable_to_list_test/01: Crash
-iterable_to_list_test/none: Crash
-iterable_to_set_test: Crash
-iterable_tostring_test: Crash
-json_map_test: Crash
 linked_hash_map_from_iterable_test: Crash
 linked_hash_map_from_iterables_test: Crash
 linked_hash_map_test: Crash