Rename kPMColor_SkColorType to kN32_SkColorType.

The new name better represents what this flag means.

BUG=skia:2384
R=reed@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/227433009

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@14117 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed