Retire exclusions from pre-submit checks

neterror.css no longer uses obsolete CSS, thus it no longer needs to be
excluded from checks.

distilledpage_ios.css was removed in
https://chromium-review.googlesource.com/c/chromium/src/+/1956372

Change-Id: I6670a714ac891132d34b8656e5ddc6eea9a9c589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3343506
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/main@{#953432}

PRESUBMIT.py

@@ -3720,8 +3720,6 @@ def CheckNoDeprecatedCss(input_api, output_api):
                    input_api.DEFAULT_FILES_TO_SKIP +
                    (r"^chrome/common/extensions/docs",
                     r"^chrome/docs",
-                    r"^components/dom_distiller/core/css/distilledpage_ios.css",
-                    r"^components/neterror/resources/neterror.css",
                     r"^native_client_sdk"))
   file_filter = lambda f: input_api.FilterSourceFile(
       f, files_to_check=file_inclusion_pattern, files_to_skip=files_to_skip)