Allow app_shell to run past extension manifest parsing

apps/shell/shell_extensions_client.cc

 // Copyright 2013 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 "apps/shell/shell_extensions_client.h"
 
 #include "base/logging.h"
 #include "chrome/common/extensions/features/base_feature_provider.h"
+#include "extensions/common/common_manifest_handlers.h"
+#include "extensions/common/manifest_handler.h"
 #include "extensions/common/permissions/permission_message_provider.h"
 #include "extensions/common/permissions/permissions_provider.h"
 #include "extensions/common/url_pattern_set.h"
 
 using extensions::APIPermissionInfo;
 using extensions::APIPermissionSet;
 using extensions::Extension;
 using extensions::Manifest;
 using extensions::PermissionMessage;
 using extensions::PermissionMessages;
@@ skipping 65 matching lines @@
 
 }  // namespace
 
 ShellExtensionsClient::ShellExtensionsClient() {
 }
 
 ShellExtensionsClient::~ShellExtensionsClient() {
 }
 
 void ShellExtensionsClient::Initialize() {
+  extensions::RegisterCommonManifestHandlers();
+  extensions::ManifestHandler::FinalizeRegistration();
+
   // TODO(jamescook): Do we need to whitelist any extensions?
 }
 
 const extensions::PermissionsProvider&
 ShellExtensionsClient::GetPermissionsProvider() const {
   NOTIMPLEMENTED();
   static ShellPermissionsProvider provider;
   return provider;
 }
 
@@ skipping 35 matching lines @@
   return URLPatternSet();
 }
 
 bool ShellExtensionsClient::IsScriptableURL(const GURL& url,
                                             std::string* error) const {
   NOTIMPLEMENTED();
   return true;
 }
 
 }  // namespace apps