Remove interpolation FIXME and DEFAULT_FONT_SIZE

This is just not going to happen, and with the new config we have no good way of
supporting a DEFAULT_FONT_SIZE.

qutebrowser/config/configdata.py

@@ -24,9 +24,6 @@ Module attributes:
 DATA: A dict of Option objects after init() has been called.
 """
 
-# FIXME:conf reintroduce interpolation?
-
-import sys
 import collections
 import functools
 
@@ -34,12 +31,6 @@ from qutebrowser.config import configtypes
 from qutebrowser.utils import usertypes, qtutils, utils
 
 DATA = None
-
-
-# FIXME:conf what to do about this?
-DEFAULT_FONT_SIZE = '10pt' if sys.platform == 'darwin' else '8pt'
-
-
 Option = collections.namedtuple('Option', ['name', 'typ', 'default',
                                            'backends', 'raw_backends',
                                            'description'])

scripts/dev/run_vulture.py

@@ -110,8 +110,6 @@ def whitelist_generator():
     yield 'types.ModuleType.c'  # configfiles:read_config_py
 
     yield 'include_aliases'
-    ## FIXME:conf TODO
-    yield 'qutebrowser.config.configdata.DEFAULT_FONT_SIZE'
 
     for attr in ['_get_default_metavar_for_optional',
                  '_get_default_metavar_for_positional', '_metavar_formatter']: