Add ptr_util.h from base until std::make_unique<> available

core/fpdfapi/fpdf_page/fpdf_page_parser.cpp

Index: core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
index 18a2e2d88225e5df50b28b6793a40a95cec33ea2..8d0fb8e4a4e23cb188f27038973a576c59398894 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
@@ -36,6 +36,7 @@
 #include "core/fxcrt/fx_safe_types.h"
 #include "core/fxge/cfx_graphstatedata.h"
 #include "core/fxge/cfx_pathdata.h"
+#include "third_party/base/ptr_util.h"
 
 namespace {
 
@@ -790,7 +791,7 @@ CPDF_ImageObject* CPDF_StreamContentParser::AddImage(CPDF_Stream* pStream,
     pImageObj->SetUnownedImage(m_pDocument->LoadImageF(pStream));
   } else {
     pImageObj->SetOwnedImage(
-        WrapUnique(new CPDF_Image(m_pDocument, pStream, bInline)));
+        pdfium::MakeUnique<CPDF_Image>(m_pDocument, pStream, bInline));
   }
   SetGraphicStates(pImageObj.get(), pImageObj->GetImage()->IsMask(), FALSE,
                    FALSE);