Migrated test block 15 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 9aa1ca787860d6fa974b3615ddea044edf173bcf..c821fabe546cb39bd1b4a5d38ddfabf3ed346643 100644
--- a/tests/corelib/corelib.status
+++ b/tests/corelib/corelib.status
@@ -12,7 +12,6 @@ string_case_test/01: Fail # Bug 18061
 int_parse_radix_test/01: Pass, Fail # JS implementations disagree on U+0085 being whitespace.
 int_parse_radix_test/02: Fail # No bigints.
 integer_to_radix_string_test: RuntimeError # issue 22045
-list_unmodifiable_test: Pass, RuntimeError # Issue 28712
 
 [ $runtime == safari || $runtime == safarimobilesim ]
 double_round3_test: Fail, OK # Runtime rounds 0.49999999999999994 to 1.
@@ -41,7 +40,6 @@ regress_r21715_test: RuntimeError # Requires bigint support.
 list_as_map_test: Pass, Slow # TODO(kasperl): Please triage.
 
 [ $compiler == dart2js && $runtime == safarimobilesim ]
-list_test/01: Fail # Safari bug: Array(-2) seen as dead code.
 
 # Analyzer's implementation of fromEnvironment assumes that undefined
 # environment variables have an unspecified value (rather than being
@@ -204,11 +202,6 @@ list_set_all_test: Crash
 list_set_range_test: Crash
 list_sort_test: RuntimeError
 list_sublist_test: Crash
-list_test/01: Crash
-list_test/none: Crash
-list_to_string2_test: Crash
-list_to_string_test: Crash
-list_unmodifiable_test: Crash
 regexp/parentheses_test: Crash
 regress_r21715_test: RuntimeError
 set_containsAll_test: Crash