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/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 050fc4a..c8fbf3d 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -958,7 +958,7 @@
     fSlideMenu = new SkOSMenu;
     this->addMenu(fSlideMenu);
 
-    this->setColorType(kN32_SkColorType);
+    this->setColorType(kPMColor_SkColorType);
     this->setVisibleP(true);
     this->setClipToBounds(false);
 
@@ -1449,7 +1449,7 @@
 
         SkBaseDevice* device = orig->getDevice();
         SkBitmap bmp;
-        if (device->accessBitmap(false).copyTo(&bmp, kN32_SkColorType)) {
+        if (device->accessBitmap(false).copyTo(&bmp, kPMColor_SkColorType)) {
             static int gSampleGrabCounter;
             SkString name;
             name.printf("sample_grab_%d.png", gSampleGrabCounter++);
@@ -1552,7 +1552,7 @@
     kUnknown_SkColorType,           // none -> none
     kUnknown_SkColorType,           // a8 -> none
     kARGB_4444_SkColorType,         // 565 -> 4444
-    kN32_SkColorType,               // 4444 -> 8888
+    kPMColor_SkColorType,           // 4444 -> 8888
     kRGB_565_SkColorType,           // 8888 -> 565
     kRGB_565_SkColorType,           // 8888 -> 565
     kUnknown_SkColorType,           // index8 -> none