Do not load extension system in the Profile import process.

chrome/browser/extensions/extension_system.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 "chrome/browser/extensions/extension_system.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 184 matching lines @@
       new ExtensionIconSource(profile_));
 
   // 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.
   // The InitEventRouters call used to be in BrowserMain, because when bookmark
   // import happened on first run, the bookmark bar was not being correctly
   // initialized (see issue 40144). Now that bookmarks aren't imported and
   // the event routers need to be initialized for every profile individually,
   // initialize them with the extension service.
-  // If this profile is being created as part of the import process, never
-  // initialize the event routers. If import is going to run in a separate
-  // process (the profile itself is on the main process), wait for import to
-  // finish before initializing the routers.
-  if (!command_line->HasSwitch(switches::kImport) &&
-      !command_line->HasSwitch(switches::kImportFromFile)) {
-    if (g_browser_process->profile_manager()->will_import()) {
-      extension_service_->InitEventRoutersAfterImport();
-    } else {
-      extension_service_->InitEventRouters();
-    }
+  // If import is going to run in a separate process (the profile itself is on
+  // the main process), wait for import to finish before initializing the
+  // routers.
+  CHECK(!ProfileManager::IsImportProcess(*command_line));
+  if (g_browser_process->profile_manager()->will_import()) {
+    extension_service_->InitEventRoutersAfterImport();
+  } else {
+    extension_service_->InitEventRouters();
   }
 
   extension_warning_service_.reset(new ExtensionWarningService(profile_));
   extension_warning_badge_service_.reset(
       new ExtensionWarningBadgeService(profile_));
   extension_warning_service_->AddObserver(
       extension_warning_badge_service_.get());
 }
 
 void ExtensionSystemImpl::Shared::Shutdown() {
@@ skipping 201 matching lines @@
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const extension_misc::UnloadedExtensionReason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ExtensionInfoMap::RemoveExtension, info_map(),
                  extension_id, reason));
 }
 
 }  // namespace extensions