Revert of Change extension icon load errors to warnings

extensions/common/manifest_handlers/icons_handler.cc

Index: extensions/common/manifest_handlers/icons_handler.cc
diff --git a/extensions/common/manifest_handlers/icons_handler.cc b/extensions/common/manifest_handlers/icons_handler.cc
index 52597e5b621327320b950aa84cb00d919ff3964c..20ad025b25ba879eaeb8dab1f3d86f4ceef92bc4 100644
--- a/extensions/common/manifest_handlers/icons_handler.cc
+++ b/extensions/common/manifest_handlers/icons_handler.cc
@@ -64,7 +64,7 @@ bool IconsHandler::Parse(Extension* extension, base::string16* error) {
   }
 
   if (!manifest_handler_helpers::LoadIconsFromDictionary(
-          extension, icons_dict, &icons_info->icons, error)) {
+          icons_dict, &icons_info->icons, error)) {
     return false;
   }