Revert of Rename kPMColor_SkColorType to kN32_SkColorType.

Revert of Rename kPMColor_SkColorType to kN32_SkColorType. (https://codereview.chromium.org/227433009/)

Reason for revert:
breaking the Chrome deps roll.
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20%28dbg%29/builds/839/steps/compile/logs/stdio

Original issue's description:
> Rename kPMColor_SkColorType to kN32_SkColorType.
> 
> The new name better represents what this flag means.
> 
> BUG=skia:2384
> 
> Committed: http://code.google.com/p/skia/source/detail?r=14117

TBR=reed@google.com,scroggo@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2384
Committed: http://code.google.com/p/skia/source/detail?r=14144

[benchen, 2014-04-10 22:35:49]

Created Revert of Rename kPMColor_SkColorType to kN32_SkColorType.

[commit-bot: I haz the power, 2014-04-10 22:35:59]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/bensong@google.com/234243002/1

[commit-bot: I haz the power, 2014-04-10 22:37:10]

Change committed as 14144

[benchen, 2014-04-10 22:48:32]

A revert of this CL has been created in
https://codereview.chromium.org/233813004/ by bensong@google.com.

The reason for reverting is: fixes on the chrome side are landing (brettw), keep
fingers crossed..

[scroggo, 2014-04-11 17:14:52]

A revert of this CL has been created in
https://codereview.chromium.org/235523003/ by scroggo@google.com.

The reason for reverting is: Want to reland the original CL..