tools: Remove unused `bright_red_output` context manager.

This context manager is no longer in use since the linter visual
updates.

tools/lint

@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 from __future__ import print_function
 from __future__ import absolute_import
-from contextlib import contextmanager
 import logging
 import os
 import sys
@@ -17,18 +16,6 @@ sanity_check.check_venv(__file__)
 import lister
 from typing import cast, Callable, Dict, Iterator, List
 
-@contextmanager
-def bright_red_output():
-    # type: () -> Iterator[None]
-    # Make the lint output bright red
-    sys.stdout.write('\x1B[1;31m')
-    sys.stdout.flush()
-    try:
-        yield
-    finally:
-        # Restore normal terminal colors
-        sys.stdout.write('\x1B[0m')
-
 
 def run_parallel(lint_functions):
     # type: (Dict[str, Callable[[], int]]) -> bool
@@ -155,7 +142,6 @@ def run():
 
         lint_functions[name] = run_linter
 
-    with bright_red_output():
     external_linter('add_class', ['tools/find-add-class'])
     external_linter('css', ['tools/check-css'], ['css'])
     external_linter('eslint', ['node', 'node_modules/.bin/eslint', '--quiet'], ['js'])