Make JSONParser a pure interface.

chrome/browser/web_resource/chrome_web_resource_service.cc

Index: chrome/browser/web_resource/chrome_web_resource_service.cc
diff --git a/chrome/browser/web_resource/chrome_web_resource_service.cc b/chrome/browser/web_resource/chrome_web_resource_service.cc
index 6e1e35ea1ca00ed8537ef9af48d00665153e1fd8..2ab82e85cc82c7c4c9f879d4e322678c9f724e19 100644
--- a/chrome/browser/web_resource/chrome_web_resource_service.cc
+++ b/chrome/browser/web_resource/chrome_web_resource_service.cc
@@ -38,9 +38,8 @@ void ChromeWebResourceService::ParseJSON(
     const std::string& data,
     const SuccessCallback& success_callback,
     const ErrorCallback& error_callback) {
-  // SafeJsonParser releases itself on completion.
-  scoped_refptr<safe_json::SafeJsonParser> json_parser(
-      new safe_json::SafeJsonParser(data, success_callback,
-                                           error_callback));
+  // SafeJsonParser deletes itself on completion.
+  safe_json::SafeJsonParser* json_parser =
+      safe_json::SafeJsonParser::Create(data, success_callback, error_callback);
   json_parser->Start();
 }