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This changes a few things about the ByteQueue class:
- Growth is now done as std::max(size_needed, 1.25 * size_) in line with
how base::circular_deque grows -- in local tests this seems to yield a
significant memory savings depending on the content.
- In rare cases where there's no used data, the existing allocation is
released before a new one is acquired (to reduce total memory pressure).

BUG=none
TEST=Android bot shows ~1-3% reduction in memory.

Change-Id: Iec376d61bff08fa4723129aed9edb03bb220c7b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1691581
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676181}