Bypass ServiceWorker when the request originates from isolated world.

chrome/test/data/extensions/api_test/service_worker/content_script_fetch/content_script.js

Index: chrome/test/data/extensions/api_test/service_worker/content_script_fetch/content_script.js
diff --git a/chrome/test/data/extensions/api_test/service_worker/content_script_fetch/content_script.js b/chrome/test/data/extensions/api_test/service_worker/content_script_fetch/content_script.js
new file mode 100644
index 0000000000000000000000000000000000000000..6f7a0f3fe02cb9dade8f814df2d49a313aed6de1
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/service_worker/content_script_fetch/content_script.js
@@ -0,0 +1,26 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+fetch(chrome.runtime.getURL('data_for_content_script'))
+  .then(function(res) { return res.text(); })
+  .then(function(txt) {
+      if (txt != 'original data\n')
+        throw 'Fetch() result error: ' + txt;
+      return new Promise(function(resolve) {
+          var xhr = new XMLHttpRequest();
+          xhr.addEventListener('load', function() {
+              resolve(xhr.response);
+            });
+          xhr.open('GET', chrome.runtime.getURL('data_for_content_script'));
+          xhr.send();
+        });
+    })
+  .then(function(txt) {
+      if (txt != 'original data\n')
+        throw 'XMLHttpRequest result error: ' + txt;
+      chrome.runtime.connect().postMessage('Success');
+    })
+  .catch(function(e) {
+      chrome.runtime.connect().postMessage('Failure: ' + e);
+    });