Remove IFWL_*::Create methods, use new

xfa/fwl/lightwidget/cfwl_pushbutton.cpp

Index: xfa/fwl/lightwidget/cfwl_pushbutton.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_pushbutton.cpp b/xfa/fwl/lightwidget/cfwl_pushbutton.cpp
index 79afe805cd578748b0437f862595d56f9a08f324..5ffd4efcd50f2bc0a71abb8901da620207340b2e 100644
--- a/xfa/fwl/lightwidget/cfwl_pushbutton.cpp
+++ b/xfa/fwl/lightwidget/cfwl_pushbutton.cpp
@@ -8,6 +8,8 @@
 
 #include <memory>
 
+#include "third_party/base/ptr_util.h"
+
 IFWL_PushButton* CFWL_PushButton::GetWidget() {
   return static_cast<IFWL_PushButton*>(m_pIface.get());
 }
@@ -23,8 +25,9 @@ FWL_Error CFWL_PushButton::Initialize(
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
-  std::unique_ptr<IFWL_PushButton> pPushButton(IFWL_PushButton::Create(
-      m_pProperties->MakeWidgetImpProperties(&m_buttonData), nullptr));
+  std::unique_ptr<IFWL_PushButton> pPushButton =
+      pdfium::MakeUnique<IFWL_PushButton>(
+          m_pProperties->MakeWidgetImpProperties(&m_buttonData));
   FWL_Error ret = pPushButton->Initialize();
   if (ret != FWL_Error::Succeeded) {
     return ret;