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..47a1335316ebe87ca1856f1b675138890687497d 100644
--- a/chrome/browser/web_resource/chrome_web_resource_service.cc
+++ b/chrome/browser/web_resource/chrome_web_resource_service.cc
@@ -38,9 +38,5 @@ 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));
-  json_parser->Start();
+  safe_json::SafeJsonParser::Parse(data, success_callback, error_callback);
 }