Functions that return non-const internal data should not be const because it provides a loophole ar…

Functions that return non-const internal data should not be const
as it provides a loophole around const.

I've removed const from platform_canvas() and sk_canvas(), if
anyone tries to access these from a const instance of Canvas, it
won't compile.

Committed: https://crrev.com/788debf1d9ccd4387c68fd6d6294fa4c1392bba6
Cr-Commit-Position: refs/heads/master@{#295104}

[hendrikw, 2014-09-16 15:47:53]

hendrikw@chromium.org changed reviewers:
+ sky@chromium.org

[hendrikw, 2014-09-16 15:47:53]

PTAL thanks!

[sky, 2014-09-16 16:45:04]

LGTM

[hendrikw, 2014-09-16 16:51:03]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2014-09-16 16:51:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/560463004/1

[commit-bot: I haz the power, 2014-09-16 18:16:49]

Committed patchset #1 (id:1) as 5397afca9355ed955706419375eb7dbf15c93d94

[commit-bot: I haz the power, 2014-09-16 18:19:09]

Patchset 1 (id:??) landed as
https://crrev.com/788debf1d9ccd4387c68fd6d6294fa4c1392bba6
Cr-Commit-Position: refs/heads/master@{#295104}