Remove deprecated call_tip since 6.0 (#14607)

Nothing should be using it.

IPython/core/oinspect.py

@@ -334,43 +334,6 def format_argspec(argspec):
     return inspect.formatargspec(argspec['args'], argspec['varargs'],
                                  argspec['varkw'], argspec['defaults'])
 
-@undoc
-def call_tip(oinfo, format_call=True):
-    """DEPRECATED since 6.0. Extract call tip data from an oinfo dict."""
-    warnings.warn(
-        "`call_tip` function is deprecated as of IPython 6.0"
-        "and will be removed in future versions.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    # Get call definition
-    argspec = oinfo.get('argspec')
-    if argspec is None:
-        call_line = None
-    else:
-        # Callable objects will have 'self' as their first argument, prune
-        # it out if it's there for clarity (since users do *not* pass an
-        # extra first argument explicitly).
-        try:
-            has_self = argspec['args'][0] == 'self'
-        except (KeyError, IndexError):
-            pass
-        else:
-            if has_self:
-                argspec['args'] = argspec['args'][1:]
-
-        call_line = oinfo['name']+format_argspec(argspec)
-
-    # Now get docstring.
-    # The priority is: call docstring, constructor docstring, main one.
-    doc = oinfo.get('call_docstring')
-    if doc is None:
-        doc = oinfo.get('init_docstring')
-    if doc is None:
-        doc = oinfo.get('docstring','')
-
-    return call_line, doc
-
 
 def _get_wrapped(obj):
     """Get the original object if wrapped in one or more @decorators