Fix unique ptrs in fpdfppo.cpp

testing/resources/bug_664284.in

Index: testing/resources/bug_664284.in
diff --git a/testing/resources/bug_664284.in b/testing/resources/bug_664284.in
new file mode 100644
index 0000000000000000000000000000000000000000..50ba8e050a270651573da9c80ea34fcf4b3e05ce
--- /dev/null
+++ b/testing/resources/bug_664284.in
@@ -0,0 +1,75 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+  /ViewerPreferences <<
+    /Foo /foo
+    /HideToolbar true
+    /Direction /R2L
+    /ViewArea /CropBox
+    /NumCopies 5
+  >>
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [
+    3 0 R
+  ]
+>>
+endobj
+% Page number 0.
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <</F1 15 0 R>>
+  >>
+  /Contents [21 0 R]
+  /MediaBox [0 0 612 792]
+  /Annots [999 0 R]
+>>
+endobj
+% Font resource.
+{{object 15 0}} <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Arial
+>>
+endobj
+% Content for page 0.
+{{object 21 0}} <<
+  /Length 0
+>>
+stream
+BT
+/F1 20 Tf
+100 600 TD (Page1)Tj
+ET
+endstream
+endobj
+% Annots array
+{{object 999 0}} [
+  29 0 R
+]
+endobj
+{{object 29 0}} <<
+  /Dest 37 0 R
+  /Type /Annot
+>>
+endobj
+{{object 37 0}} [
+  11 0 R
+]
+endobj
+{{object 11 0}} <<
+  /Type /Page
+>>
+{{xref}}
+trailer <<
+  /Size 6
+  /Root 1 0 R
+>>
+{{startxref}}
+%%EOF