Stop testing SkImageDecoder in DM/nanobench

We have already used it for comparison, and are switching forward
to using SkCodec. This also allows us to simplify the code for checking
the extensions we support for images.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1641663002

Review URL: https://codereview.chromium.org/1641663002

1 files changed, 0 insertions, 12 deletions

diff --git a/dm/DMSrcSink.h b/dm/DMSrcSink.h
index 632744cd62..d02eeaf101 100644
--- a/dm/DMSrcSink.h
+++ b/dm/DMSrcSink.h
@@ -180,18 +180,6 @@ private:
     uint32_t                                 fSampleSize;
 };
 
-class ImageSrc : public Src {
-public:
-    explicit ImageSrc(Path path);
-
-    Error draw(SkCanvas*) const override;
-    SkISize size() const override;
-    Name name() const override;
-    bool veto(SinkFlags) const override;
-private:
-    Path fPath;
-};
-
 class SKPSrc : public Src {
 public:
     explicit SKPSrc(Path path);