Cache --whitelisted-extension-id in SimpleFeature.

chrome/common/extensions/manifest_tests/extension_manifests_platformapp_unittest.cc

 // Copyright (c) 2012 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 "base/command_line.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/memory/linked_ptr.h"
 #include "chrome/common/extensions/manifest_handlers/app_isolation_info.h"
 #include "chrome/common/extensions/manifest_tests/chrome_manifest_test.h"
 #include "extensions/common/error_utils.h"
+#include "extensions/common/features/simple_feature.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/manifest_handlers/csp_info.h"
 #include "extensions/common/manifest_handlers/incognito_info.h"
 #include "extensions/common/switches.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 namespace errors = manifest_errors;
 
@@ skipping 53 matching lines @@
     Testcase(
         "init_platform_app_csp_warning_2.json",
         "'app.content_security_policy' is not allowed for specified extension "
             "ID.")
   };
   RunTestcases(
       warning_testcases, arraysize(warning_testcases), EXPECT_TYPE_WARNING);
 
   // Whitelisted ones can (this is the ID corresponding to the base 64 encoded
   // key in the init_platform_app_csp.json manifest.)
-  std::string test_id = "ahplfneplbnjcflhdgkkjeiglkkfeelb";
-  base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
-      switches::kWhitelistedExtensionID, test_id);
+  extensions::SimpleFeature::ScopedWhitelistForTest whitelist(
+      "ahplfneplbnjcflhdgkkjeiglkkfeelb");
   scoped_refptr<Extension> extension =
       LoadAndExpectSuccess("init_platform_app_csp.json");
   EXPECT_EQ(0U, extension->install_warnings().size())
       << "Unexpected warning " << extension->install_warnings()[0].message;
   EXPECT_TRUE(extension->is_platform_app());
   EXPECT_EQ("default-src 'self' https://www.google.com;",
             CSPInfo::GetResourceContentSecurityPolicy(extension.get(),
                                                       std::string()));
 
   // But even whitelisted ones must specify a secure policy.
@@ skipping 43 matching lines @@
 
   // Now try again with the experimental flag set.
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);
   for (size_t i = 0; i < arraysize(kPlatformAppExperimentalApis); ++i) {
     LoadAndExpectSuccess(ManifestData(manifests[i].get(), ""));
   }
 }
 
 }  // namespace extensions