Remove ImageSkia::empty and ImageSkia::extractSubset

ui/gfx/image/image_skia.cc

Index: ui/gfx/image/image_skia.cc
diff --git a/ui/gfx/image/image_skia.cc b/ui/gfx/image/image_skia.cc
index b2ede647ad0b52cb33016a3018f624cc88fb1a47..65f2d48741233911458e18986c57f6ea12c4d56c 100644
--- a/ui/gfx/image/image_skia.cc
+++ b/ui/gfx/image/image_skia.cc
@@ -237,10 +237,6 @@ std::vector<ImageSkiaRep> ImageSkia::GetRepresentations() const {
 
 #endif  // OS_MACOSX
 
-bool ImageSkia::empty() const {
-  return isNull() || storage_->size().IsEmpty();
-}
-
 int ImageSkia::width() const {
   return isNull() ? 0 : storage_->size().width();
 }
@@ -253,12 +249,6 @@ int ImageSkia::height() const {
   return isNull() ? 0 : storage_->size().height();
 }
 
-bool ImageSkia::extractSubset(ImageSkia* dst, const SkIRect& subset) const {
-  gfx::Rect rect(subset.x(), subset.y(), subset.width(), subset.height());
-  *dst = ImageSkiaOperations::ExtractSubset(*this, rect);
-  return (!dst->isNull());
-}
-
 std::vector<ImageSkiaRep> ImageSkia::image_reps() const {
   if (isNull())
     return std::vector<ImageSkiaRep>();