Remove STL use from platform/assert.cc

runtime/vm/assert_test.cc

Index: runtime/vm/assert_test.cc
diff --git a/runtime/vm/assert_test.cc b/runtime/vm/assert_test.cc
index 625f23b7d7e97e99ad41c8aa798e0af5521a893d..dc935f1c099d82377baa0cd7d699078c194e90f6 100644
--- a/runtime/vm/assert_test.cc
+++ b/runtime/vm/assert_test.cc
@@ -46,3 +46,18 @@ UNIT_TEST_CASE(Expect) {
   EXPECT_FLOAT_EQ(15.43, 15.44, 0.01);
   EXPECT_FLOAT_EQ(1.43, 1.43, 0.00);
 }
+
+
+UNIT_TEST_CASE(Fail0) {
+  FAIL("This test fails");
+}
+
+
+UNIT_TEST_CASE(Fail1) {
+  FAIL1("This test fails with one argument: %d", 4);
+}
+
+
+UNIT_TEST_CASE(Fail2) {
+  FAIL2("This test fails with two arguments: %d, %d", -100, 42);
+}