relnote: Protected by --quic_fix_cubic_bytes_quantization. Fix CubicBytes Quantization.

relnote: Protected by --quic_fix_cubic_bytes_quantization. Fix CubicBytes Quantization.

Due to an unfortunate ordering of operations in the actual "cubing" part of the CWND
calculation, we were inadvertantly quantizing the congestion-window calculation.
(Note: The "reno" part of the cubic algorithm wis smooth and not quantized before.)
Switching the order of operations obviates the problem.

Additionally, removed parameterization from cubic_test.cc and
cubic_bytes_test.cc, because the parameterization was getting
unwieldy.  Instead, the parameters are controlled by command-line
flag.

Merge internal change: 141183279

BUG=

[Zhongyi Shi, 2016-12-12 22:03:35]

The CQ bit was checked by zhongyi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-12 22:05:26]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-13 00:51:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-13 00:51:50]

Dry run: Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Zhongyi Shi, 2016-12-13 02:38:57]

zhongyi@chromium.org changed reviewers:
+ rch@chromium.org

[Ryan Hamilton, 2016-12-13 03:51:22]

lgtm