Revert "testing: migrate some tests to python3"

This reverts commit 99f2ce39334374f2e7b001d81737feb411b0138d.

Reason for revert: Speculative revert
NativeMessaging tests started failing on mac and there is no obvious culprit in the blamelist.
https://ci.chromium.org/ui/p/chromium/builders/ci/mac11-arm64-rel-tests/3724

Original change's description:
> testing: migrate some tests to python3
>
> To suppress UnicodeDecodeError, add an wrapper class for stdin in
> asan_symbolize.py.
>
> Fixed: 1288169
> Change-Id: I5d5b8726b148b3bf95887803911bd47c696a3da2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3423288
> Reviewed-by: Joe Downing <joedow@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#966056}

Change-Id: Ie47853985626bfa7dc75cc4b9b9f44552593d417
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3431019
Auto-Submit: Christos Froussios <cfroussios@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Owners-Override: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Christoph Schwering <schwering@google.com>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/main@{#966146}
NOKEYCHECK=True
GitOrigin-RevId: 9b8a696a5670d3dd603a981784f20bfb6580ceb2

asan/asan_symbolize.py

diff --git a/asan/asan_symbolize.py b/asan/asan_symbolize.py
index 1d45322..7f999b8 100755
--- a/asan/asan_symbolize.py
+++ b/asan/asan_symbolize.py
@@ -212,29 +212,6 @@
     return binary_path
 
 
-class CheckUTF8:
-  # This wraps stream and show warnings if stream gets invalid data as utf-8.
-  def __init__(self, stream):
-    self._stream = stream
-
-  def __iter__(self):
-    return self
-
-  def __next__(self):
-
-    l = self._stream.buffer.readline()
-
-    if not l:
-      raise StopIteration
-
-    try:
-      return l.decode()
-    except UnicodeDecodeError:
-      print("WARNING: asan_symbolize.py failed to decode %s (base64 encoded)" %
-            base64.b64encode(l).decode())
-      return ""
-
-
 def main():
   parser = argparse.ArgumentParser(description='Symbolize sanitizer reports.')
   parser.add_argument('--test-summary-json-file',
@@ -276,10 +253,7 @@
       symbolize_snippets_in_json(args.test_summary_json_file, loop)
     else:
       # Process stdin.
-      if sys.version_info.major > 2:
-        asan_symbolize.logfile = CheckUTF8(sys.stdin)
-      else:
-        asan_symbolize.logfile = sys.stdin
+      asan_symbolize.logfile = sys.stdin
       loop.process_logfile()