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

Be suspicious of |new|.  This removes some of the
easy cases.

Review-Url: https://codereview.chromium.org/2571913002
diff --git a/xfa/fwl/cfwl_combobox.cpp b/xfa/fwl/cfwl_combobox.cpp
index eb6bb63..7e5d1b8 100644
--- a/xfa/fwl/cfwl_combobox.cpp
+++ b/xfa/fwl/cfwl_combobox.cpp
@@ -56,8 +56,8 @@
       pdfium::MakeUnique<CFWL_ComboList>(m_pOwnerApp, std::move(prop), this);
 
   if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_CMB_DropDown) && !m_pEdit) {
-    m_pEdit.reset(new CFWL_ComboEdit(
-        m_pOwnerApp, pdfium::MakeUnique<CFWL_WidgetProperties>(), this));
+    m_pEdit = pdfium::MakeUnique<CFWL_ComboEdit>(
+        m_pOwnerApp, pdfium::MakeUnique<CFWL_WidgetProperties>(), this);
     m_pEdit->SetOuter(this);
   }
   if (m_pEdit)