Consolidate PixelRef flattables with the standard impl

The flatten method on these functions can no longer be
const as SkFlattenables declaration is not const and 
would result in the const methods only being called when
the reference to the object was const.
Review URL: https://codereview.appspot.com/5941043

git-svn-id: http://skia.googlecode.com/svn/trunk@3533 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/images/SkImageRef.h b/include/images/SkImageRef.h
index f0f06b6..8fc4754 100644
--- a/include/images/SkImageRef.h
+++ b/include/images/SkImageRef.h
@@ -61,7 +61,7 @@
     SkImageDecoderFactory* setDecoderFactory(SkImageDecoderFactory*);
 
     // overrides
-    virtual void flatten(SkFlattenableWriteBuffer&) const;
+    virtual void flatten(SkFlattenableWriteBuffer&);
 
 protected:
     /** Override if you want to install a custom allocator.