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Occasionally logs grow to a huge size (1GB+) and trying to read them into memory inside SystemLogUploader causes a crash.

Bug: 729446
Change-Id: Ieb2f8beb90ef775f785ca814d6531544a410d257
Reviewed-on: https://chromium-review.googlesource.com/527054
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477922}