Remove xfa_common.h and IWYU.

xfa/src/fxfa/src/app/xfa_ffpageview.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/src/foxitlib.h"
 #include "xfa/src/fxfa/src/app/xfa_ffcheckbutton.h"
 #include "xfa/src/fxfa/src/app/xfa_ffchoicelist.h"
 #include "xfa/src/fxfa/src/app/xfa_ffdoc.h"
 #include "xfa/src/fxfa/src/app/xfa_ffdocview.h"
 #include "xfa/src/fxfa/src/app/xfa_fffield.h"
 #include "xfa/src/fxfa/src/app/xfa_ffimageedit.h"
 #include "xfa/src/fxfa/src/app/xfa_ffpageview.h"
 #include "xfa/src/fxfa/src/app/xfa_ffpushbutton.h"
 #include "xfa/src/fxfa/src/app/xfa_fftextedit.h"
 #include "xfa/src/fxfa/src/app/xfa_ffwidget.h"
 #include "xfa/src/fxfa/src/app/xfa_fwladapter.h"
-#include "xfa/src/fxfa/src/common/xfa_common.h"
+
 CXFA_FFPageView::CXFA_FFPageView(CXFA_FFDocView* pDocView, CXFA_Node* pPageArea)
     : CXFA_ContainerLayoutItem(pPageArea),
       m_pDocView(pDocView),
       m_bLoaded(FALSE) {}
 CXFA_FFPageView::~CXFA_FFPageView() {}
 IXFA_DocView* CXFA_FFPageView::GetDocView() {
   return m_pDocView;
 }
 int32_t CXFA_FFPageView::GetPageViewIndex() {
   return GetPageIndex();
@@ skipping 384 matching lines @@
     CXFA_LayoutItem* pLayoutItem) {
   if (CXFA_FFWidget* pWidget = XFA_GetWidgetFromLayoutItem(pLayoutItem)) {
     if (!pWidget->IsLoaded() &&
         (pWidget->GetStatus() & XFA_WIDGETSTATUS_Visible)) {
       pWidget->LoadWidget();
     }
     return pWidget;
   }
   return NULL;
 }