Make ImageBitmap::cropImage a static function.

Make ImageBitmap::cropImage a static function.

It doesn't access any members of ImageBitmap, nor is it called in any other
source file.

Committed: https://crrev.com/750a86605e5d15b0ae06d62c42a4f2318597f6e3
Cr-Commit-Position: refs/heads/master@{#361005}

[jbroman, 2015-11-20 19:52:44]

jbroman@chromium.org changed reviewers:
+ junov@chromium.org

[jbroman, 2015-11-20 19:52:44]

Was skimming some ImageBitmap code; wondered how cropping an SkImage relied on
members of ImageBitmap. Turns out it doesn't.

Super minor improvement, but it would have saved me \epsilon cognitive overhead.
WDYT?

[Justin Novosad, 2015-11-21 03:52:42]

+cc xidachen

lgtm

[Justin Novosad, 2015-11-21 04:26:40]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2015-11-21 04:27:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1466773002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1466773002/1

[commit-bot: I haz the power, 2015-11-21 04:32:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-21 04:33:20]

Patchset 1 (id:??) landed as
https://crrev.com/750a86605e5d15b0ae06d62c42a4f2318597f6e3
Cr-Commit-Position: refs/heads/master@{#361005}