Revert of Rename kPMColor_SkColorType to kN32_SkColorType.

src/effects/SkAlphaThresholdFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAlphaThresholdFilter.h"
 #include "SkBitmap.h"
 #include "SkReadBuffer.h"
@@ skipping 288 matching lines @@
 void SkAlphaThresholdFilterImpl::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeScalar(fInnerThreshold);
     buffer.writeScalar(fOuterThreshold);
     buffer.writeRegion(fRegion);
 }
 
 bool SkAlphaThresholdFilterImpl::onFilterImage(Proxy*, const SkBitmap& src,
                                                const Context& ctx, SkBitmap* dst,
                                                SkIPoint* offset) const {
-    SkASSERT(src.colorType() == kN32_SkColorType);
+    SkASSERT(src.colorType() == kPMColor_SkColorType);
 
-    if (src.colorType() != kN32_SkColorType) {
+    if (src.colorType() != kPMColor_SkColorType) {
         return false;
     }
 
     SkMatrix localInverse;
     if (!ctx.ctm().invert(&localInverse)) {
         return false;
     }
 
     SkAutoLockPixels alp(src);
     SkASSERT(src.getPixels());
@@ skipping 36 matching lines @@
                                                   (U8CPU)(SkColorGetG(source) * scale),
                                                   (U8CPU)(SkColorGetB(source) * scale));
                 }
             }
             dptr[y * dst->width() + x] = output_color;
         }
     }
 
     return true;
 }