Revert of Add SkSpecialImage::makeTextureImage entry point & update filterInput

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 524a475b71311c65306b6fa65c2125da100894df..1a4c876d61c5ed75346e308a495a2cf73af9b609 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -596,18 +596,7 @@
         return SkRef(src);
     }
 
-    SkAutoTUnref<SkSpecialImage> result(input->filterImage(src, this->mapContext(ctx), offset));
-
-#if SK_SUPPORT_GPU
-    if (src->peekTexture() && !result->peekTexture()) {
-        // Keep the result on the GPU - this is still required for some
-        // image filters that don't support GPU in all cases
-        GrContext* context = src->peekTexture()->getContext();
-        return result->makeTextureImage(src->internal_getProxy(), context).release();
-    }
-#endif
-
-    return result.release();
+    return input->filterImage(src, this->mapContext(ctx), offset);
 }
 
 #if SK_SUPPORT_GPU