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/BitmapCopyTest.cpp b/tests/BitmapCopyTest.cpp
index 74f4ac9..f734ad8 100644
--- a/tests/BitmapCopyTest.cpp
+++ b/tests/BitmapCopyTest.cpp
@@ -188,7 +188,7 @@
     { kIndex_8_SkColorType,     "011101"  },
     { kRGB_565_SkColorType,     "010101"  },
     { kARGB_4444_SkColorType,   "010111"  },
-    { kN32_SkColorType,         "010111"  },
+    { kPMColor_SkColorType,     "010111"  },
 };
 
 static const int W = 20;
@@ -364,7 +364,7 @@
                     }
                     break;
 
-                case kN32_SkColorType:
+                case kPMColor_SkColorType:
                     if (safeSize != 0x8E1BC9BF040000LL) {
                         sizeFail = true;
                     }