When allowing an extension file:/// URL access, grant its process access to that scheme.

chrome/browser/extensions/cross_origin_xhr_apitest.cc

 // 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, CrossOriginXHRBackgroundPage) {
   host_resolver()->AddRule("*.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("cross_origin_xhr/background_page")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHRAllURLs) {
   host_resolver()->AddRule("*.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("cross_origin_xhr/all_urls")) << message_;
 }
 
-// Flaky on the trybots. See http://crbug.com/96725.
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, FLAKY_CrossOriginXHRContentScript) {
+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_;
 }
+
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHRFileAccess) {
+  ASSERT_TRUE(RunExtensionTest("cross_origin_xhr/file_access")) << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CrossOriginXHRNoFileAccess) {
+  ASSERT_TRUE(RunExtensionTestNoFileAccess(
+      "cross_origin_xhr/no_file_access")) << message_;
+}