Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

src/pdf/SkPDFGraphicState.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFGraphicState_DEFINED
 #define SkPDFGraphicState_DEFINED
@@ skipping 52 matching lines @@
         return 0 == memcmp(&fStrokeWidth, &rhs.fStrokeWidth, 12);
     }
     uint32_t hash() const { return SkOpts::hash(&fStrokeWidth, 12); }
 
 private:
     const SkScalar fStrokeWidth;
     const SkScalar fStrokeMiter;
     const uint8_t fAlpha;
     const uint8_t fStrokeCap;   // SkPaint::Cap
     const uint8_t fStrokeJoin;  // SkPaint::Join
-    const uint8_t fMode;        // SkXfermode::Mode
+    const uint8_t fMode;        // SkBlendMode
 
     SkPDFGraphicState(const SkPaint&);
 
     typedef SkPDFDict INHERITED;
 };
 
 #endif