Remove deprecated sre_compile from cpplint

This uses `re` instead, which should have similar performance with python3.

Bug: 1517826
Change-Id: If03f386d26590dcae7da6b4f27ec1ea4926065fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5197707
Reviewed-by: Scott Lee <ddoman@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Brian Ryner <bryner@google.com>

cpplint.py

@@ -52,11 +52,6 @@ import string
 import sys
 import unicodedata
 
-# FIXME(https://crbug.com/1517826): Replace deprecated import of sre_compile.
-import warnings
-with warnings.catch_warnings():
-  warnings.filterwarnings("ignore", category=DeprecationWarning)
-  import sre_compile
 
 _USAGE = r"""
 Syntax: cpplint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...]
@@ -860,7 +855,7 @@ def Match(pattern, s):
     # performance reasons; factoring it out into a separate function turns out
     # to be noticeably expensive.
     if pattern not in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
+        _regexp_compile_cache[pattern] = re.compile(pattern)
     return _regexp_compile_cache[pattern].match(s)
 
 
@@ -878,14 +873,14 @@ def ReplaceAll(pattern, rep, s):
         string with replacements made (or original string if no replacements)
     """
     if pattern not in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
+        _regexp_compile_cache[pattern] = re.compile(pattern)
     return _regexp_compile_cache[pattern].sub(rep, s)
 
 
 def Search(pattern, s):
     """Searches the string for the pattern, caching the compiled regexp."""
     if pattern not in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
+        _regexp_compile_cache[pattern] = re.compile(pattern)
     return _regexp_compile_cache[pattern].search(s)