Fix compilation error in r3350

TBR=ager@chromium.org
Review URL: http://codereview.chromium.org/435021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -3762,7 +3762,6 @@ static Object* Runtime_StringAdd(Arguments args) {
   ASSERT(args.length() == 2);
   CONVERT_CHECKED(String, str1, args[0]);
   CONVERT_CHECKED(String, str2, args[1]);
-  Counters::cons_strings_runtime.Increment();
   return Heap::AllocateConsString(str1, str2);
 }