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When piping Chrome stdout/stderr through asan_symbolize.py, we want it
to output every line immediately. Python line iterators buffer multiple
lines, so switch to using readline() directly instead.

Change-Id: I90d712c14094929e411b395d0a8d3ae00c0e9d05
Reviewed-on: https://chromium-review.googlesource.com/1114308Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570286}