Add external extensions json source in proper mac location.

chrome/browser/extensions/external_extension_provider_impl.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/extensions/external_extension_provider_impl.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/path_service.h"
@@ skipping 204 matching lines @@
     *location = loc;
 
   return true;
 }
 
 // static
 void ExternalExtensionProviderImpl::CreateExternalProviders(
     VisitorInterface* service,
     Profile* profile,
     ProviderCollection* provider_list) {
+
+  // On Mac OS, items in /Library/... should be written by the superuser.
+  // Check that all components of the path are writable by root only.
+  ExternalPrefExtensionLoader::Options options;
+#if defined(OS_MACOSX)
+  options = ExternalPrefExtensionLoader::ENSURE_PATH_CONTROLLED_BY_ADMIN;
+#else
+  options = ExternalPrefExtensionLoader::NONE;
+#endif
+
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalPrefExtensionLoader(
-                  chrome::DIR_EXTERNAL_EXTENSIONS),
+                  chrome::DIR_EXTERNAL_EXTENSIONS, options),
               Extension::EXTERNAL_PREF,
               Extension::EXTERNAL_PREF_DOWNLOAD)));
 
+#if defined(OS_MACOSX)
+  // Support old path to external extensions file as we migrate to the
+  // new one.  See crbug/67203.
+  provider_list->push_back(
+      linked_ptr<ExternalExtensionProviderInterface>(
+          new ExternalExtensionProviderImpl(
+              service,
+              new ExternalPrefExtensionLoader(
+                  chrome::DIR_DEPRICATED_EXTERNAL_EXTENSIONS,
+                  ExternalPrefExtensionLoader::NONE),
+              Extension::EXTERNAL_PREF,
+              Extension::EXTERNAL_PREF_DOWNLOAD)));
+#endif
+
 #if defined(OS_CHROMEOS)
   // Chrome OS specific source for OEM customization.
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalPrefExtensionLoader(
                   chrome::DIR_USER_EXTERNAL_EXTENSIONS),
               Extension::EXTERNAL_PREF,
               Extension::EXTERNAL_PREF_DOWNLOAD)));
 #endif
 #if defined(OS_WIN)
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalRegistryExtensionLoader,
               Extension::EXTERNAL_REGISTRY,
               Extension::INVALID)));
 #endif
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalPolicyExtensionLoader(profile),
               Extension::INVALID,
               Extension::EXTERNAL_POLICY_DOWNLOAD)));
 }