Googletest export

Make generating goldens work with Python 3

golden_file.write(output) fails with Python 3 with:
TypeError: a bytes-like object is required, not 'str'
PiperOrigin-RevId: 282316101

googletest/test/googletest-output-test.py

@@ -331,7 +331,7 @@ if __name__ == '__main__':
     if CAN_GENERATE_GOLDEN_FILE:
       output = GetOutputOfAllCommands()
       golden_file = open(GOLDEN_PATH, 'wb')
-      golden_file.write(output)
+      golden_file.write(output.encode())
       golden_file.close()
     else:
       message = (