Fix http_server_response_test.dart not to use snapshots as its data.

tests/standalone/io/http_server_response_test.dart

Index: tests/standalone/io/http_server_response_test.dart
diff --git a/tests/standalone/io/http_server_response_test.dart b/tests/standalone/io/http_server_response_test.dart
index 967a5080652ab7dbfdc46dd8dc510f8c31a6d483..c3c0afb51d6326fb79d28afd0f7da37f4a23433f 100644
--- a/tests/standalone/io/http_server_response_test.dart
+++ b/tests/standalone/io/http_server_response_test.dart
@@ -6,12 +6,18 @@
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
+// OtherResources=http_server_response_test.dart
 
 import "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 import "dart:typed_data";
 
+// Platform.script may refer to a AOT or JIT snapshot, which are significantly
+// larger.
+File scriptSource = new File(
+    Platform.script.resolve("http_server_response_test.dart").toFilePath());
+
 void testServerRequest(void handler(server, request),
                        {int bytes,
                         bool closeClient}) {
@@ -81,7 +87,7 @@ void testResponseDone() {
 
 
 void testResponseAddStream() {
-  File file = new File(Platform.script.toFilePath());
+  File file = scriptSource;
   int bytes = file.lengthSync();
 
   testServerRequest((server, request) {
@@ -130,7 +136,7 @@ void testResponseAddStream() {
 
 
 void testResponseAddStreamClosed() {
-  File file = new File(Platform.script.toFilePath());
+  File file = scriptSource;
   testServerRequest((server, request) {
     request.response.addStream(file.openRead())
         .then((response) {
@@ -160,7 +166,7 @@ void testResponseAddStreamClosed() {
 
 
 void testResponseAddClosed() {
-  File file = new File(Platform.script.toFilePath());
+  File file = scriptSource;
   testServerRequest((server, request) {
     request.response.add(file.readAsBytesSync());
     request.response.close();