Remove an extra comma from "tick" log records.

This fixes VM state fetching from "tick" log records.

TBR=vitalyr@chromium.org
BUG=1287
TEST=none

Review URL: http://codereview.chromium.org/6718041

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7403 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/log.cc

@@ -1134,7 +1134,6 @@ void Logger::TickEvent(TickSample* sample, bool overflow) {
   msg.AppendAddress(sample->pc);
   msg.Append(',');
   msg.AppendAddress(sample->sp);
-  msg.Append(',');
   if (sample->has_external_callback) {
     msg.Append(",1,");
     msg.AppendAddress(sample->external_callback);