Make JSONParser a pure interface.

chrome/browser/ui/app_list/search/common/json_response_fetcher.cc

Index: chrome/browser/ui/app_list/search/common/json_response_fetcher.cc
diff --git a/chrome/browser/ui/app_list/search/common/json_response_fetcher.cc b/chrome/browser/ui/app_list/search/common/json_response_fetcher.cc
index f175e44b01981587938d95f525a267d1b5bc0201..5eb72b96ef8fb5ed0a02b91cb9d81be1b39c3ae7 100644
--- a/chrome/browser/ui/app_list/search/common/json_response_fetcher.cc
+++ b/chrome/browser/ui/app_list/search/common/json_response_fetcher.cc
@@ -72,14 +72,12 @@ void JSONResponseFetcher::OnURLFetchComplete(
   std::string json_data;
   fetcher->GetResponseAsString(&json_data);
 
-  scoped_refptr<safe_json::SafeJsonParser> parser =
-      new safe_json::SafeJsonParser(
-          json_data, base::Bind(&JSONResponseFetcher::OnJsonParseSuccess,
-                                weak_factory_.GetWeakPtr()),
-          base::Bind(&JSONResponseFetcher::OnJsonParseError,
-                     weak_factory_.GetWeakPtr()));
   // The parser will call us back via one of the callbacks.
-  parser->Start();
+  safe_json::SafeJsonParser::Parse(
+      json_data, base::Bind(&JSONResponseFetcher::OnJsonParseSuccess,
+                            weak_factory_.GetWeakPtr()),
+      base::Bind(&JSONResponseFetcher::OnJsonParseError,
+                 weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace app_list