Do not load extension system in the Profile import process.

chrome/browser/first_run/first_run_win.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/first_run/first_run.h"
 
 #include <shellapi.h>
 #include <shlobj.h>
 #include <windows.h>
 
@@ skipping 320 matching lines @@
     switches::kCountry,
   };
   import_cmd.CopySwitchesFrom(cmdline, kSwitchNames, arraysize(kSwitchNames));
 
   // Since ImportSettings is called before the local state is stored on disk
   // we pass the language as an argument.  GetApplicationLocale checks the
   // current command line as fallback.
   import_cmd.AppendSwitchASCII(switches::kLang,
                                g_browser_process->GetApplicationLocale());
 
+  // Always run BrowserMain, even in tests.
+  import_cmd.AppendSwitch(switches::kLaunchAsBrowser);
+
   if (items_to_import) {
     import_cmd.AppendSwitchASCII(switches::kImport,
         EncodeImportParams(importer_type, items_to_import, skip_first_run_ui));
   }
 
   if (!import_bookmarks_path.empty()) {
     import_cmd.AppendSwitchPath(switches::kImportFromFile,
                                 import_bookmarks_path);
   }
 
@@ skipping 152 matching lines @@
 
 FilePath MasterPrefsPath() {
   // The standard location of the master prefs is next to the chrome binary.
   FilePath master_prefs;
   if (!PathService::Get(base::DIR_EXE, &master_prefs))
     return FilePath();
   return master_prefs.AppendASCII(installer::kDefaultMasterPrefs);
 }
 
 }  // namespace first_run