strip dead code in gprof2dot.py

tools/gprof2dot.py

@@ -1715,16 +1715,6 @@ class CallgrindParser(LineParser):
             return None
         key, value = pair
         return value
-        line = self.lookahead()
-        mo = self._key_re.match(line)
-        if not mo:
-            return None
-        key, value = line.split(':', 1)
-        if key not in keys:
-            return None
-        value = value.strip()
-        self.consume()
-        return key, value
 
     def parse_keys(self, keys):
         line = self.lookahead()