Avoid VS 2015 truncation warning

Avoid VS 2015 truncation warning

battor_agent.cc(78): warning C4267: conversion from size_t to uint8_t

This was missed by the VS 2015 fyi bots because battor_agent is not one
of their targets.

size_t is a better choice than uint8_t anyway.

BUG=440500

[brucedawson, 2016-01-12 00:56:36]

brucedawson@chromium.org changed reviewers:
+ primiano@chromium.org

[brucedawson, 2016-01-12 00:56:36]

Soon we'll be on VS 2015 and these won't be a problem.

This depends on a CL that is in the commit queue - I'm not quite sure how that
works...

PTAL?

[Primiano Tucci (use gerrit), 2016-01-12 10:09:43]

primiano@chromium.org changed reviewers:
+ charliea@chromium.org

[Primiano Tucci (use gerrit), 2016-01-12 10:09:43]

LGTM

[brucedawson, 2016-01-12 18:16:05]

The CQ bit was checked by brucedawson@chromium.org

[commit-bot: I haz the power, 2016-01-12 18:16:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1577983004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1577983004/1

[commit-bot: I haz the power, 2016-01-12 18:21:31]

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

[commit-bot: I haz the power, 2016-01-12 18:21:31]

Try jobs failed on following builders:
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_gn_rel on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_gn_r...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[brucedawson, 2016-01-12 18:45:39]

crrev.com/1579753002 fixed this independently, which is why there were merge
conflicts. I'm going to close this CL.