Use canned CheckPatchFormatted instead of our own linting

This calls into git cl format, so it should always be consistent with
that.

Removes all the old clang-format scripts and dependencies.

Change-Id: I879577a5c1df81617ec0d33096ce7884f4413659
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/24840
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

PRESUBMIT.py

@@ -17,40 +17,14 @@ import platform
 import subprocess
 
 
-def _DoClangFormat(input_api, output_api):
-    if platform.system() == 'Linux' and platform.architecture()[0] == '64bit':
-        clang_format_path = 'buildtools/linux64/clang-format'
-    elif platform.system() == 'Darwin':
-        clang_format_path = 'buildtools/mac/clang-format'
-    else:
-        return [output_api.PresubmitNotifyResult('Skipping clang-format')]
-
-    # We need to know which commit to diff against. It doesn't seem to be exposed anywhere
-    # except in that private member of presubmit_support.Change. This is likely to break
-    # but hopefully we have an updated clang-format in CPID/GS before it does.
-    upstream_commit = input_api.change._upstream
-    if upstream_commit == None:
-        return []
-
-    lint_cmd = [
-        'scripts/lint_clang_format.sh', clang_format_path, upstream_commit
-    ]
-
-    # Call the linting script and forward the output as a notification or as an error
-    try:
-        output = subprocess.check_output(lint_cmd)
-        return [output_api.PresubmitNotifyResult(output)]
-    except subprocess.CalledProcessError as e:
-        return [output_api.PresubmitError(e.output)]
-
-
 def _DoCommonChecks(input_api, output_api):
     results = []
     results.extend(
         input_api.canned_checks.CheckChangedLUCIConfigs(input_api, output_api))
     results.extend(
-        input_api.canned_checks.CheckGNFormatted(input_api, output_api))
-    results.extend(_DoClangFormat(input_api, output_api))
+        input_api.canned_checks.CheckPatchFormatted(input_api,
+                                                    output_api,
+                                                    check_python=True))
     return results