Revert of add Make variations to return SkImage by sk_sp

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 ade891f4cb3d54ff9264af8da3a8cc256192c4af..9e2efe98b5bd8c6a92ac5f2ae1478172ec44d055 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -46,7 +46,7 @@
     // Caller must call unref when they are done.
     virtual GrTexture* asTextureRef(GrContext*, const GrTextureParams&) const = 0;
 
-    virtual sk_sp<SkImage> onMakeSubset(const SkIRect&) const = 0;
+    virtual SkImage* onNewSubset(const SkIRect&) const = 0;
 
     // If a ctx is specified, then only gpu-specific formats are requested.
     virtual SkData* onRefEncoded(GrContext*) const { return nullptr; }