Avoid the ptr.reset(new XXX()) anti-pattern

fpdfsdk/fpdfdoc.cpp

Index: fpdfsdk/fpdfdoc.cpp
diff --git a/fpdfsdk/fpdfdoc.cpp b/fpdfsdk/fpdfdoc.cpp
index ce4fc34982f143b47708681e376e78b753b37b10..82b898aa85b86a1b52abff90536f039411eca55e 100644
--- a/fpdfsdk/fpdfdoc.cpp
+++ b/fpdfsdk/fpdfdoc.cpp
@@ -17,6 +17,7 @@
 #include "core/fpdfdoc/cpdf_dest.h"
 #include "core/fpdfdoc/cpdf_pagelabel.h"
 #include "fpdfsdk/fsdk_define.h"
+#include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 
 namespace {
@@ -55,7 +56,7 @@ CPDF_LinkList* GetLinkList(CPDF_Page* page) {
   CPDF_Document* pDoc = page->m_pDocument;
   std::unique_ptr<CPDF_LinkList>* pHolder = pDoc->LinksContext();
   if (!pHolder->get())
-    pHolder->reset(new CPDF_LinkList);
+    *pHolder = pdfium::MakeUnique<CPDF_LinkList>();
   return pHolder->get();
 }