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

Reason for revert:
Chrome's side of define changes not easy to figure out quickly. Reverting this for DEPS roll for now.

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

R=reed@google.com, scroggo@google.com
TBR=reed@google.com, scroggo@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2384

Author: bensong@google.com

Review URL: https://codereview.chromium.org/234833003

git-svn-id: http://skia.googlecode.com/svn/trunk@14149 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/mac/SkCreateCGImageRef.cpp b/src/utils/mac/SkCreateCGImageRef.cpp
index 00166e9..7687c3c 100644
--- a/src/utils/mac/SkCreateCGImageRef.cpp
+++ b/src/utils/mac/SkCreateCGImageRef.cpp
@@ -34,7 +34,7 @@
                 *upscaleTo32 = true;
             }
             // fall through
-        case kN32_SkColorType:
+        case kPMColor_SkColorType:
             *bitsPerComponent = 8;
 #if SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
             *info = kCGBitmapByteOrder32Big;
@@ -94,7 +94,7 @@
         copy = new SkBitmap;
         // here we make a ceep copy of the pixels, since CG won't take our
         // 565 directly
-        bm.copyTo(copy, kN32_SkColorType);
+        bm.copyTo(copy, kPMColor_SkColorType);
     } else {
         copy = new SkBitmap(bm);
     }