Extensions: Make it possible for permission parsing code to return a detailed error message.

chrome/browser/extensions/api/permissions/permissions_api_helpers.cc

Index: chrome/browser/extensions/api/permissions/permissions_api_helpers.cc
===================================================================
--- chrome/browser/extensions/api/permissions/permissions_api_helpers.cc	(revision 247036)
+++ chrome/browser/extensions/api/permissions/permissions_api_helpers.cc	(working copy)
@@ -71,6 +71,7 @@
     const Permissions& permissions,
     bool allow_file_access,
     std::string* error) {
+  DCHECK(error);
   APIPermissionSet apis;
   std::vector<std::string>* permissions_list = permissions.permissions.get();
   if (permissions_list) {
@@ -107,7 +108,7 @@
         }
 
         CHECK(permission);
-        if (!permission->FromValue(permission_json.get())) {
+        if (!permission->FromValue(permission_json.get(), NULL)) {
           *error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
           return NULL;
         }