[Extensions] DCHECK that ExtensionFunctions respond (and only once)

chrome/browser/extensions/api/screenlock_private/screenlock_private_apitest.cc

 // Copyright 2013 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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 62 matching lines @@
                    extensions::NOTIFICATION_EXTENSION_TEST_MESSAGE,
                    content::NotificationService::AllSources());
     ExtensionApiTest::RunTestOnMainThreadLoop();
     registrar_.RemoveAll();
   }
 
   // content::NotificationObserver override:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override {
-    const std::string& content = *content::Details<std::string>(details).ptr();
-    if (content == kAttemptClickAuthMessage) {
+    const std::string& message =
+        content::Details<std::pair<std::string, bool*>>(details).ptr()->first;
+    if (message == kAttemptClickAuthMessage) {
       proximity_auth::ScreenlockBridge::Get()->lock_handler()->SetAuthType(
           test_account_id_,
           proximity_auth::ScreenlockBridge::LockHandler::USER_CLICK,
           base::string16());
       EasyUnlockService::Get(profile())->AttemptAuth(test_account_id_);
     }
   }
 
   // Loads |extension_name| and waits for a pass / fail notification.
   void RunTest(const std::string& extension_name) {
@@ skipping 22 matching lines @@
   RunTest("screenlock_private/lock_unlock");
 }
 
 IN_PROC_BROWSER_TEST_F(ScreenlockPrivateApiTest, AuthType) {
   RunTest("screenlock_private/auth_type");
 }
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace extensions