build(clint): remove "function size is too large" warning

This warning is essentially only triggered for ported vim functions.
It's unlikely that we'll refactor vim functions solely based on their
size since it'd mean we'd greatly deviate from vim, which is a high cost
when it comes to importing the vim patches. Thus, this warning only
serves as an annoyance and should be removed.

src/clint.py

@@ -44,7 +44,6 @@ same line, but it is far from perfect (in either direction).
 import codecs
 import copy
 import getopt
-import math  # for log
 import os
 import re
 import sre_compile
@@ -183,7 +182,6 @@ _ERROR_CATEGORIES = [
     'readability/alt_tokens',
     'readability/bool',
     'readability/braces',
-    'readability/fn_size',
     'readability/multiline_comment',
     'readability/multiline_string',
     'readability/nul',
@@ -642,32 +640,6 @@ class _FunctionState:
         if self.in_a_function:
             self.lines_in_function += 1
 
-    def Check(self, error, filename, linenum):
-        """Report if too many lines in function body.
-
-        Args:
-          error: The function to call with any errors found.
-          filename: The name of the current file.
-          linenum: The number of the line to check.
-        """
-        if Match(r'T(EST|est)', self.current_function):
-            base_trigger = self._TEST_TRIGGER
-        else:
-            base_trigger = self._NORMAL_TRIGGER
-        trigger = base_trigger * 2**_VerboseLevel()
-
-        if self.lines_in_function > trigger:
-            error_level = int(
-                math.log(self.lines_in_function / base_trigger, 2))
-            # 50 => 0, 100 => 1, 200 => 2, 400 => 3, 800 => 4, 1600 => 5, ...
-            if error_level > 5:
-                error_level = 5
-            error(filename, linenum, 'readability/fn_size', error_level,
-                  'Small and focused functions are preferred:'
-                  ' %s has %d non-comment lines'
-                  ' (error triggered by exceeding %d lines).' % (
-                      self.current_function, self.lines_in_function, trigger))
-
     def End(self):
         """Stop analyzing function body."""
         self.in_a_function = False
@@ -1887,7 +1859,6 @@ def CheckForFunctionLengths(filename, clean_lines, linenum,
             error(filename, linenum, 'readability/fn_size', 5,
                   'Lint failed to find start of function body.')
     elif Match(r'^\}\s*$', line):  # function end
-        function_state.Check(error, filename, linenum)
         function_state.End()
     elif not Match(r'^\s*$', line):
         function_state.Count()  # Count non-blank/non-comment lines.