Change NetLog::ParametersCallback to return a scoped_ptr.

net/http/http_request_headers.h

Index: net/http/http_request_headers.h
diff --git a/net/http/http_request_headers.h b/net/http/http_request_headers.h
index d0666de9c431949c6ce20bf9ba04438920a4c779..f3d318ab4dbf6b9082af425c5a2383dd1ebbde0b 100644
--- a/net/http/http_request_headers.h
+++ b/net/http/http_request_headers.h
@@ -147,8 +147,8 @@ class NET_EXPORT HttpRequestHeaders {
 
   // Takes in the request line and returns a Value for use with the NetLog
   // containing both the request line and all headers fields.
-  base::Value* NetLogCallback(const std::string* request_line,
-                              NetLogCaptureMode capture_mode) const;
+  scoped_ptr<base::Value> NetLogCallback(const std::string* request_line,
+                                         NetLogCaptureMode capture_mode) const;
 
   // Takes in a Value created by the above function, and attempts to extract the
   // request line and create a copy of the original headers.  Returns true on