Revert of Rename kPMColor_SkColorType to kN32_SkColorType.

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 3045782895a5b8c35fc7fb0168ca62e1177dba4e..6f6d99140bc80881d01903702e0cb556911f9d08 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -229,7 +229,7 @@
     if (kRGB_565_SkColorType == info.colorType()) {
         info.fAlphaType = kOpaque_SkAlphaType;  // force this setting
     } else {
-        info.fColorType = kN32_SkColorType;
+        info.fColorType = kPMColor_SkColorType;
         if (kOpaque_SkAlphaType != info.alphaType()) {
             info.fAlphaType = kPremul_SkAlphaType;  // force this setting
         }