remove SkImage::applyFilter() -- unused, can always re-add later

src/image/SkImage_Base.h

Index: src/image/SkImage_Base.h
diff --git a/src/image/SkImage_Base.h b/src/image/SkImage_Base.h
index 4689abb3b78d5f7bdb1a3e08dad95e1040c1e8ac..83e51a58b7cd8f2754a699ea6e0de1f864942d31 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -39,9 +39,6 @@ public:
     // but only inspect them (or encode them).
     virtual bool getROPixels(SkBitmap*, CachingHint = kAllow_CachingHint) const = 0;
 
-    virtual SkImage* onApplyFilter(SkImageFilter*, SkIPoint* offset,
-                                   bool forceResultToOriginalSize) const;
-
     virtual SkSurface* onNewSurface(const SkImageInfo& info) const {
         return SkSurface::NewRaster(info);
     }