Remove a dict.has_key() usage in profile to silence a -3 DeprecationWarning.

Lib/profile.py

@@ -318,7 +318,7 @@ class Profile:
         fn = ("", 0, self.c_func_name)
         self.cur = (t, 0, 0, fn, frame, self.cur)
         timings = self.timings
-        if timings.has_key(fn):
+        if fn in timings:
             cc, ns, tt, ct, callers = timings[fn]
             timings[fn] = cc, ns+1, tt, ct, callers
         else: