Recent image filter work now allows this check to be enabled.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2379053002

Review-Url: https://codereview.chromium.org/2379053002
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index f4ac150..5e9b68d 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -224,8 +224,7 @@
     // by, including internal usage. We allow a null color space here, for read/write pixels and
     // other special code paths. If a color space is provided, though, enforce all other rules.
     if (colorSpace && !SkSurface_Gpu::Valid(fContext, rt->config(), colorSpace.get())) {
-        // SRGBTODO: Enable this assert once image filters are propagating color type and space
-//        SkDEBUGFAIL("Invalid config and colorspace combination");
+        SkDEBUGFAIL("Invalid config and colorspace combination");
         return nullptr;
     }