Rename kPMColor_SkColorType to kN32_SkColorType.

The new name better represents what this flag means.

BUG=skia:2384
R=reed@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/227433009

git-svn-id: http://skia.googlecode.com/svn/trunk@14117 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 0200cab..3922244 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -205,8 +205,8 @@
         (displInput && !displInput->filterImage(proxy, src, ctx, &displ, &displOffset))) {
         return false;
     }
-    if ((displ.colorType() != kPMColor_SkColorType) ||
-        (color.colorType() != kPMColor_SkColorType)) {
+    if ((displ.colorType() != kN32_SkColorType) ||
+        (color.colorType() != kN32_SkColorType)) {
         return false;
     }
     SkIRect bounds;