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/CachedDecodingPixelRefTest.cpp b/tests/CachedDecodingPixelRefTest.cpp
index 705f066..b2ecb0f 100644
--- a/tests/CachedDecodingPixelRefTest.cpp
+++ b/tests/CachedDecodingPixelRefTest.cpp
@@ -189,7 +189,7 @@
         }
         info->fWidth = TestImageGenerator::Width();
         info->fHeight = TestImageGenerator::Height();
-        info->fColorType = kN32_SkColorType;
+        info->fColorType = kPMColor_SkColorType;
         info->fAlphaType = kOpaque_SkAlphaType;
         return true;
     }
@@ -202,7 +202,7 @@
         REPORTER_ASSERT(fReporter, rowBytes >= minRowBytes);
         if ((NULL == pixels)
             || (fType != kSucceedGetPixels_TestType)
-            || (info.fColorType != kN32_SkColorType)) {
+            || (info.fColorType != kPMColor_SkColorType)) {
             return false;
         }
         char* bytePtr = static_cast<char*>(pixels);