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

chrome/browser/extensions/extension_messages_apitest.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 <stddef.h>
 #include <stdint.h>
 #include <utility>
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
@@ skipping 111 matching lines @@
 #else
 #define MAYBE_Messaging Messaging
 #endif
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MAYBE_Messaging) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("messaging/connect")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingCrash) {
   ASSERT_TRUE(StartEmbeddedTestServer());
-  ExtensionTestMessageListener ready_to_crash("ready_to_crash", true);
+  ExtensionTestMessageListener ready_to_crash("ready_to_crash", false);
   ASSERT_TRUE(LoadExtension(
           test_data_dir_.AppendASCII("messaging/connect_crash")));
   ui_test_utils::NavigateToURL(
       browser(), embedded_test_server()->GetURL("/extensions/test_file.html"));
   content::WebContents* tab =
       browser()->tab_strip_model()->GetActiveWebContents();
   EXPECT_TRUE(ready_to_crash.WaitUntilSatisfied());
 
   ResultCatcher catcher;
   CrashTab(tab);
@@ skipping 1107 matching lines @@
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR,
             CanConnectAndSendMessagesToMainFrame(invalid.get()));
 }
 
 #endif  // !defined(OS_WIN) - http://crbug.com/350517.
 
 }  // namespace
 
 };  // namespace extensions