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/tests/BlitRowTest.cpp b/tests/BlitRowTest.cpp
index 911f2a0..b8ac0c0 100644
--- a/tests/BlitRowTest.cpp
+++ b/tests/BlitRowTest.cpp
@@ -63,7 +63,7 @@
 static Proc find_proc(const SkBitmap& bm, SkPMColor expect32, uint16_t expect16,
                       uint8_t expect8, uint32_t* expect) {
     switch (bm.colorType()) {
-        case kN32_SkColorType:
+        case kPMColor_SkColorType:
             *expect = expect32;
             return proc_32;
         case kARGB_4444_SkColorType:
@@ -101,7 +101,7 @@
     static const int W = 256;
 
     static const SkColorType gDstColorType[] = {
-        kN32_SkColorType,
+        kPMColor_SkColorType,
         kRGB_565_SkColorType,
     };
 
@@ -192,7 +192,7 @@
     static const int H = W;
 
     static const SkColorType gDstColorType[] = {
-        kN32_SkColorType,
+        kPMColor_SkColorType,
         kRGB_565_SkColorType,
     };