Bug 1354624 - Remove mRefDT member from PrintTargetSkPDF. r=bobowen

MozReview-Commit-ID: Hz5clt9EeBf

gfx/thebes/PrintTargetSkPDF.h

@@ -66,7 +66,6 @@ private:
   sk_sp<SkDocument> mRefPDFDoc;
   sk_sp<SkCanvas> mRefCanvas;
   SkDynamicMemoryWStream mRefOStream;
-  RefPtr<DrawTarget> mRefDT;
 };
 
 } // namespace gfx