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

xfa/fxfa/app/xfa_ffdocview.cpp

Index: xfa/fxfa/app/xfa_ffdocview.cpp
diff --git a/xfa/fxfa/app/xfa_ffdocview.cpp b/xfa/fxfa/app/xfa_ffdocview.cpp
index 78b690afc1edaa2830d3f9b89cdd88afa82c3618..e88517c00c19071bed11c3cd62d08bb66482815c 100644
--- a/xfa/fxfa/app/xfa_ffdocview.cpp
+++ b/xfa/fxfa/app/xfa_ffdocview.cpp
@@ -7,6 +7,7 @@
 #include "xfa/fxfa/xfa_ffdocview.h"
 
 #include "core/fxcrt/fx_ext.h"
+#include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fxfa/app/xfa_ffbarcode.h"
 #include "xfa/fxfa/app/xfa_ffcheckbutton.h"
@@ -313,9 +314,9 @@ int32_t CXFA_FFDocView::ProcessWidgetEvent(CXFA_EventParam* pParam,
   return XFA_EVENTERROR_Success;
 }
 CXFA_FFWidgetHandler* CXFA_FFDocView::GetWidgetHandler() {
-  if (!m_pWidgetHandler) {
-    m_pWidgetHandler.reset(new CXFA_FFWidgetHandler(this));
-  }
+  if (!m_pWidgetHandler)
+    m_pWidgetHandler = pdfium::MakeUnique<CXFA_FFWidgetHandler>(this);
+
   return m_pWidgetHandler.get();
 }