Change loading custom auth extension to load from --auth-ext-path value.

chrome/browser/extensions/component_loader.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/component_loader.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/path_service.h"
@@ skipping 149 matching lines @@
 }
 
 std::string ComponentLoader::AddOrReplace(const base::FilePath& path) {
   base::FilePath absolute_path = base::MakeAbsoluteFilePath(path);
   std::string error;
   scoped_ptr<DictionaryValue> manifest(
       extension_file_util::LoadManifest(absolute_path, &error));
   if (!manifest) {
     LOG(ERROR) << "Could not load extension from '" <<
                   absolute_path.value() << "'. " << error;
-    return NULL;
+    return std::string();

[achuithb, 2013/05/23 22:34:47]

let's split this file out of this CL.

   }
   Remove(GenerateId(manifest.get(), absolute_path));
 
   return Add(manifest.release(), absolute_path);
 }
 
 void ComponentLoader::Reload(const std::string& extension_id) {
   for (RegisteredComponentExtensions::iterator it =
          component_extensions_.begin(); it != component_extensions_.end();
          ++it) {
@@ skipping 313 matching lines @@
       prefs::kEnterpriseWebStoreURL,
       std::string() /* default_value */,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterStringPref(
       prefs::kEnterpriseWebStoreName,
       std::string() /* default_value */,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace extensions