Elide the "size" property from a unit test -- platform specific.

R=rmacnak@google.com

Review URL: https://codereview.chromium.org//555973002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40047 260f80e4-7a28-3924-810f-c04153c831b5

runtime/vm/service_test.cc

@@ -584,11 +584,12 @@ TEST_CASE(Service_Objects) {
   Service::HandleIsolateMessage(isolate, service_msg);
   handler.HandleNextMessage();
   handler.filterMsg("_vmName");
+  handler.filterMsg("size");
   EXPECT_STREQ(
       "{\"type\":\"bool\","
       "\"class\":{\"type\":\"@Class\",\"id\":\"classes\\/46\","
       "\"name\":\"bool\"},"
-      "\"size\":8,\"fields\":[],\"id\":\"objects\\/bool-true\","
+      "\"fields\":[],\"id\":\"objects\\/bool-true\","
       "\"valueAsString\":\"true\"}",
       handler.msg());