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/samplecode/SampleEncode.cpp b/samplecode/SampleEncode.cpp
index 080c05f..4769fbb 100644
--- a/samplecode/SampleEncode.cpp
+++ b/samplecode/SampleEncode.cpp
@@ -43,7 +43,7 @@
                       SkIntToScalar(width)/2, paint);
 
     switch (ct) {
-        case kN32_SkColorType:
+        case kPMColor_SkColorType:
             bm->swap(device);
             break;
         case kRGB_565_SkColorType: {
@@ -81,7 +81,7 @@
 
 // configs to build the original bitmap in. Can be at most these 3
 static const SkColorType gColorTypes[] = {
-    kN32_SkColorType,
+    kPMColor_SkColorType,
     kRGB_565_SkColorType,
     kIndex_8_SkColorType,   // opaque
     kIndex_8_SkColorType    // alpha