Allow features to refer to subkeys in _manifest_features.json.

chrome/common/extensions/extension.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/common/extensions/extension.h"
 
 #include "base/base64.h"
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 1863 matching lines @@
 }
 
 bool Extension::LoadBackgroundPersistent(
     const ExtensionAPIPermissionSet& api_permissions,
     string16* error) {
   Value* background_persistent = NULL;
   if (!api_permissions.count(ExtensionAPIPermission::kExperimental) ||
       !manifest_->Get(keys::kBackgroundPersistent, &background_persistent))
     return true;
 
-  if (!background_persistent->IsType(Value::TYPE_BOOLEAN) ||
-      !background_persistent->GetAsBoolean(&background_page_is_persistent_)) {
+  if (!background_persistent->GetAsBoolean(&background_page_is_persistent_)) {
     *error = ASCIIToUTF16(errors::kInvalidBackgroundPersistent);
     return false;
   }
 
   if (!has_background_page()) {
     *error = ASCIIToUTF16(errors::kInvalidBackgroundPersistentNoPage);
     return false;
   }
 
   return true;
@@ skipping 1758 matching lines @@
     already_disabled(false),
     extension(extension) {}
 
 UpdatedExtensionPermissionsInfo::UpdatedExtensionPermissionsInfo(
     const Extension* extension,
     const ExtensionPermissionSet* permissions,
     Reason reason)
     : reason(reason),
       extension(extension),
       permissions(permissions) {}