Use WebFrame::setIsolatedWorldSecurityOrigin to allow cross-origin XHRs in content scripts.

chrome/browser/extensions/cross_origin_xhr_apitest.cc

Index: chrome/browser/extensions/cross_origin_xhr_apitest.cc
diff --git a/chrome/browser/extensions/cross_origin_xhr_apitest.cc b/chrome/browser/extensions/cross_origin_xhr_apitest.cc
index a7f7abb444e52c3c8dbeee0393ef55c96a967525..a8a7469957f430fbe0379f8df6bc90016b97387d 100644
--- a/chrome/browser/extensions/cross_origin_xhr_apitest.cc
+++ b/chrome/browser/extensions/cross_origin_xhr_apitest.cc
@@ -1,12 +1,18 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "net/base/mock_host_resolver.h"
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHR) {
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHRBackgroundPage) {
   host_resolver()->AddRule("*.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());
-  ASSERT_TRUE(RunExtensionTest("cross_origin_xhr")) << message_;
+  ASSERT_TRUE(RunExtensionTest("cross_origin_xhr/background_page")) << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHRContentScript) {
+  host_resolver()->AddRule("*.com", "127.0.0.1");
+  ASSERT_TRUE(StartTestServer());
+  ASSERT_TRUE(RunExtensionTest("cross_origin_xhr/content_script")) << message_;
 }