Change the order the classes are expected to be found by serialize_test

This solves test failure triggered by:
https://codereview.chromium.org/1498963004/
Fixes issue #25125

R=fschneider@google.com

Review URL: https://codereview.chromium.org/1505743003 .

tests/try/poi/serialize_test.dart

@@ -518,15 +518,15 @@ final coreImports = [
     "name": "Pattern",
     "kind": "class"
   },
+  {
+    "name": "Match",
+    "kind": "class"
+  },
   {
     "name": "print",
     "kind": "function",
     "type": "(Object) -> void"
   },
-  {
-    "name": "Match",
-    "kind": "class"
-  },
   {
     "name": "RegExp",
     "kind": "class"

tests/try/try.status

@@ -39,9 +39,6 @@ poi/serialize_test: SkipByDesign # Uses dart:io.
 [ $compiler == dart2js ]
 poi/*: Skip # Issue 20031
 
-[ $compiler == dart2js && $runtime == none ]
-poi/serialize_test: RuntimeError # Issue 25125
-
 [ $compiler == dart2js ]
 # Compilation is slow, test fails at runtime due to time out, but
 # unpredictably.