Make CPDF_Stream() take unique_ptr's to its dictionary.

core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp

Index: core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
diff --git a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
index 837697273f3b6346132a106ba583e0d5afe3b1c8..3065e70ac96b5df9e97fdc0990b206a3e78f8df6 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
+++ b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
@@ -126,14 +126,14 @@ void CPDF_PageContentGenerator::ProcessForm(CFX_ByteTextBuf& buf,
   CFX_FloatRect bbox = m_pPage->GetPageBBox();
   matrix.TransformRect(bbox);
 
-  CPDF_Dictionary* pFormDict =
-      new CPDF_Dictionary(m_pDocument->GetByteStringPool());
+  auto pFormDict =
+      pdfium::MakeUnique<CPDF_Dictionary>(m_pDocument->GetByteStringPool());
   pFormDict->SetNewFor<CPDF_Name>("Type", "XObject");
   pFormDict->SetNewFor<CPDF_Name>("Subtype", "Form");
   pFormDict->SetRectFor("BBox", bbox);
 
   CPDF_Stream* pStream = m_pDocument->NewIndirect<CPDF_Stream>();
-  pStream->InitStream(data, size, pFormDict);
+  pStream->InitStream(data, size, std::move(pFormDict));
 
   CFX_ByteString name = RealizeResource(pStream->GetObjNum(), "XObject");
   buf << "/" << PDF_NameEncode(name) << " Do Q\n";