asan symbolize: Restore invalid utf-8 ignorance.

tools/valgrind/asan/asan_symbolize.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from third_party import asan_symbolize
 
 import argparse
 import base64
@@ skipping 166 matching lines @@
     original_snippet = base64.b64decode(test_run['output_snippet_base64'])
     symbolized_snippet = self.symbolize_snippet(original_snippet)
     if symbolized_snippet == original_snippet:
       # No sanitizer reports in snippet.
       return
 
     test_run['original_output_snippet'] = test_run['output_snippet']
     test_run['original_output_snippet_base64'] = \
         test_run['output_snippet_base64']
 
-    test_run['output_snippet'] = symbolized_snippet
+    test_run['output_snippet'] = symbolized_snippet.decode('utf-8', 'replace')
     test_run['output_snippet_base64'] = \
         base64.b64encode(symbolized_snippet)
     test_run['snippet_processed_by'] = 'asan_symbolize.py'
 
 
 def symbolize_snippets_in_json(filename, symbolization_loop):
   with open(filename, 'r') as f:
     json_data = json.load(f)
 
   test_run_symbolizer = JSONTestRunSymbolizer(symbolization_loop)
@@ skipping 38 matching lines @@
 
   if args.test_summary_json_file:
     symbolize_snippets_in_json(args.test_summary_json_file, loop)
   else:
     # Process stdin.
     asan_symbolize.logfile = sys.stdin
     loop.process_logfile()
 
 if __name__ == '__main__':
   main()