Change NetLog::ParametersCallback to return a scoped_ptr.

net/base/sdch_net_log_params.h

Index: net/base/sdch_net_log_params.h
diff --git a/net/base/sdch_net_log_params.h b/net/base/sdch_net_log_params.h
index a13d9de2095cef8e7e391bc58bfe51a3e867edfd..dca7463e80fe74aa0f1f7feb1e90528b33576d4e 100644
--- a/net/base/sdch_net_log_params.h
+++ b/net/base/sdch_net_log_params.h
@@ -15,13 +15,13 @@ class GURL;
 
 namespace net {
 
-NET_EXPORT base::Value* NetLogSdchResourceProblemCallback(
+NET_EXPORT scoped_ptr<base::Value> NetLogSdchResourceProblemCallback(
     SdchProblemCode problem,
     NetLogCaptureMode capture_mode);
 
 // If |is_error| is false, "net_error" field won't be added to the JSON and the
 // event won't be painted red in the netlog.
-NET_EXPORT base::Value* NetLogSdchDictionaryFetchProblemCallback(
+NET_EXPORT scoped_ptr<base::Value> NetLogSdchDictionaryFetchProblemCallback(
     SdchProblemCode problem,
     const GURL& url,
     bool is_error,