Revert of remvoe duplicate impl for SkImageInfo flattening

src/image/SkDataPixelRef.h

Index: src/image/SkDataPixelRef.h
diff --git a/src/image/SkDataPixelRef.h b/src/image/SkDataPixelRef.h
index c2e52cd9e12ccb02b5bea2bf92a674927c7926c1..50c885714b91f1c3b3c389b441363a2d499ca707 100644
--- a/src/image/SkDataPixelRef.h
+++ b/src/image/SkDataPixelRef.h
@@ -14,13 +14,13 @@
 
 class SkDataPixelRef : public SkPixelRef {
 public:
-            SkDataPixelRef(const SkImageInfo&, SkData* data, size_t rowBytes);
+            SkDataPixelRef(SkData* data);
     virtual ~SkDataPixelRef();
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDataPixelRef)
 
 protected:
-    virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;
+    virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE;
     virtual void onUnlockPixels() SK_OVERRIDE;
     virtual size_t getAllocatedSizeInBytes() const SK_OVERRIDE;
 
@@ -28,8 +28,7 @@
     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
 
 private:
-    SkData*     fData;
-    size_t      fRB;
+    SkData* fData;
 
     typedef SkPixelRef INHERITED;
 };