Add NOLINTNEXTLINE missed in prior CL.

Should have been part of
  https://pdfium-review.googlesource.com/c/pdfium/+/100680

Change-Id: I4ba03ec2e3bb9ead64facc0745fe446422b4562c
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/100682
Commit-Queue: Lei Zhang <thestig@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

fpdfsdk/fpdf_structtree.cpp

diff --git a/fpdfsdk/fpdf_structtree.cpp b/fpdfsdk/fpdf_structtree.cpp
index b0029cc..76a30be 100644
--- a/fpdfsdk/fpdf_structtree.cpp
+++ b/fpdfsdk/fpdf_structtree.cpp
@@ -163,9 +163,10 @@
     const CPDF_Array* array = attr_obj->AsArray();
     if (index < 0 || static_cast<size_t>(index) >= array->size())
       return nullptr;
+
     // TODO(tsepez): should embedder take a reference here?
-    return FPDFStructElementAttrFromCPDFDictionary(
-        array->GetDictAt(index).Get());
+    // Unretained reference in public API. NOLINTNEXTLINE
+    return FPDFStructElementAttrFromCPDFDictionary(array->GetDictAt(index));
   }
   return nullptr;
 }