Start the extension event routers for each profile, not just at browser startup.

chrome/browser/browser_main.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/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1884 matching lines @@
   // volume on the login screen.
   chromeos::SystemKeyEventListener::GetInstance();
 
   // TODO(yusukes): Remove the #if once the ARM bot (crbug.com/84694) is fixed.
 #if defined(HAVE_XINPUT2)
   // Listen for XI_HierarchyChanged events.
   chromeos::XInputHierarchyChangedEventListener::GetInstance();
 #endif
 #endif
 
-  // Initialize extension event routers. Note that on Chrome OS, this will
-  // not succeed if the user has not logged in yet, in which case the
-  // event routers are initialized in LoginUtilsImpl::CompleteLogin instead.
-  if (profile->GetExtensionService()) {
-    // This will initialize bookmarks. Call it after bookmark import is done.
-    // See issue 40144.
-    profile->GetExtensionService()->InitEventRouters();
-  }
-
   // The extension service may be available at this point. If the command line
   // specifies --uninstall-extension, attempt the uninstall extension startup
   // action.
   if (parsed_command_line.HasSwitch(switches::kUninstallExtension)) {
     ExtensionsStartupUtil ext_startup_util;
     if (ext_startup_util.UninstallExtension(parsed_command_line, profile)) {
       return ResultCodes::NORMAL_EXIT;
     } else {
       return ResultCodes::UNINSTALL_EXTENSION_ERROR;
     }
@@ skipping 170 matching lines @@
 #if defined(OS_CHROMEOS)
   // To be precise, logout (browser shutdown) is not yet done, but the
   // remaining work is negligible, hence we say LogoutDone here.
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone",
                                                         false);
   chromeos::BootTimesLoader::Get()->WriteLogoutTimes();
 #endif
   TRACE_EVENT_END_ETW("BrowserMain", 0, 0);
   return result_code;
 }