DM: "wb" (binary mode) may matter on Windows

DM: "wb" (binary mode) may matter on Windows

I suspect we might be doing some funky /n -> /r/n translations without 'b'.
This kills the PNG.

BUG=skia:

NOTREECHECKS=true

Committed: https://skia.googlesource.com/skia/+/c64137c245dd24be54f37d762c0855bd719cb3ad

[mtklein, 2015-08-25 17:45:01]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-08-25 17:45:14]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1303063008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1303063008/1

[mtklein_C, 2015-08-25 17:45:20]

mtklein@chromium.org changed reviewers:
+ stephana@google.com
- mtklein@google.com

[stephana, 2015-08-25 17:53:42]

On 2015/08/25 17:45:21, mtklein_C wrote:

lgtm

[mtklein, 2015-08-25 17:54:57]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-08-25 17:54:59]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-08-25 17:55:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1303063008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1303063008/1

[mtklein, 2015-08-25 17:55:25]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-08-25 17:55:31]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-08-25 17:55:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1303063008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1303063008/1

[commit-bot: I haz the power, 2015-08-25 17:56:11]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/c64137c245dd24be54f37d762c0855bd719cb3ad