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Python 3 distinguish butes and strings and strings are always unicode.
That's why files need to be open in binary mode and proper encoding must
be applied before write

Bug: 1168119
Change-Id: I14b65600a736eda6ad263a011ab8886f1e521f64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642679Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846004}