Rename IFWL classes which do not have CFWL equivalents

xfa/fwl/core/ifwl_formproxy.cpp

-// Copyright 2014 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#include "xfa/fwl/core/ifwl_formproxy.h"
-
-#include <memory>
-#include <utility>
-
-#include "third_party/base/ptr_util.h"
-#include "xfa/fwl/core/cfwl_notedriver.h"
-
-IFWL_FormProxy::IFWL_FormProxy(
-    const CFWL_App* app,
-    std::unique_ptr<CFWL_WidgetProperties> properties,
-    IFWL_Widget* pOuter)
-    : IFWL_Form(app, std::move(properties), pOuter) {}
-
-IFWL_FormProxy::~IFWL_FormProxy() {}
-
-FWL_Type IFWL_FormProxy::GetClassID() const {
-  return FWL_Type::FormProxy;
-}
-
-bool IFWL_FormProxy::IsInstance(const CFX_WideStringC& wsClass) const {
-  if (wsClass == CFX_WideStringC(FWL_CLASS_FormProxy))
-    return true;
-  return IFWL_Form::IsInstance(wsClass);
-}
-
-void IFWL_FormProxy::Update() {}
-
-void IFWL_FormProxy::DrawWidget(CFX_Graphics* pGraphics,
-                                const CFX_Matrix* pMatrix) {}
-
-void IFWL_FormProxy::OnProcessMessage(CFWL_Message* pMessage) {
-  m_pOuter->GetDelegate()->OnProcessMessage(pMessage);
-}