Change NetLog::ParametersCallback to return a scoped_ptr.

net/http/http_cache_transaction.cc

Index: net/http/http_cache_transaction.cc
diff --git a/net/http/http_cache_transaction.cc b/net/http/http_cache_transaction.cc
index e39a6c1c63f4f7075168020d74a0dc619dba0a1a..2b96817e56ccb6ecfc17e161b52067e6c9bd13ee 100644
--- a/net/http/http_cache_transaction.cc
+++ b/net/http/http_cache_transaction.cc
@@ -182,16 +182,16 @@ void RecordNoStoreHeaderHistogram(int load_flags,
   }
 }
 
-base::Value* NetLogAsyncRevalidationInfoCallback(
+scoped_ptr<base::Value> NetLogAsyncRevalidationInfoCallback(
     const NetLog::Source& source,
     const HttpRequestInfo* request,
     NetLogCaptureMode capture_mode) {
-  base::DictionaryValue* dict = new base::DictionaryValue();
-  source.AddToEventParameters(dict);
+  scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
+  source.AddToEventParameters(dict.get());
 
   dict->SetString("url", request->url.possibly_invalid_spec());
   dict->SetString("method", request->method);
-  return dict;
+  return dict.Pass();
 }
 
 enum ExternallyConditionalizedType {