Work around sign compare error from commit be9b894.

xfa/fwl/basewidget/fwl_editimp.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/basewidget/fwl_editimp.h"
 
 #include <algorithm>
 #include <memory>
 #include <vector>
 
+#include "third_party/base/stl_util.h"
 #include "xfa/fde/cfde_txtedtengine.h"
 #include "xfa/fde/fde_gedevice.h"
 #include "xfa/fde/fde_render.h"
 #include "xfa/fde/ifde_txtedtpage.h"
 #include "xfa/fwl/basewidget/fwl_caretimp.h"
 #include "xfa/fwl/basewidget/fwl_comboboximp.h"
 #include "xfa/fwl/basewidget/fwl_scrollbarimp.h"
 #include "xfa/fwl/basewidget/ifwl_caret.h"
 #include "xfa/fwl/basewidget/ifwl_datetimepicker.h"
 #include "xfa/fwl/core/cfwl_message.h"
@@ skipping 749 matching lines @@
   if (!CanRedo())
     return FALSE;
   return Redo(m_DoRecords[++m_iCurRecord].get());
 }
 
 FX_BOOL CFWL_EditImp::CanUndo() {
   return m_iCurRecord >= 0;
 }
 
 FX_BOOL CFWL_EditImp::CanRedo() {
-  return m_iCurRecord < m_DoRecords.size() - 1;
+  return m_iCurRecord < pdfium::CollectionSize<int32_t>(m_DoRecords) - 1;
 }
 
 FWL_Error CFWL_EditImp::SetTabWidth(FX_FLOAT fTabWidth, FX_BOOL bEquidistant) {
   if (!m_pEdtEngine)
     return FWL_Error::Indefinite;
 
   FDE_TXTEDTPARAMS* pParams = m_pEdtEngine->GetEditParams();
   pParams->fTabWidth = fTabWidth;
   pParams->bTabEquidistant = bEquidistant;
   return FWL_Error::Succeeded;
@@ skipping 662 matching lines @@
 }
 FX_BOOL CFWL_EditImp::IsContentHeightOverflow() {
   if (!m_pEdtEngine)
     return FALSE;
   IFDE_TxtEdtPage* pPage = m_pEdtEngine->GetPage(0);
   if (!pPage)
     return FALSE;
   return pPage->GetContentsBox().height > m_rtEngine.height + 1.0f;
 }
 int32_t CFWL_EditImp::AddDoRecord(IFDE_TxtEdtDoRecord* pRecord) {
-  int32_t nCount = m_DoRecords.size();
+  int32_t nCount = pdfium::CollectionSize<int32_t>(m_DoRecords);
   if (m_iCurRecord == nCount - 1) {
     if (nCount == m_iMaxRecord) {
       m_DoRecords.pop_front();
       m_iCurRecord--;
     }
   } else {
     m_DoRecords.erase(m_DoRecords.begin() + m_iCurRecord + 1,
                       m_DoRecords.end());
   }
 
   m_DoRecords.push_back(std::unique_ptr<IFDE_TxtEdtDoRecord>(pRecord));
-  m_iCurRecord = m_DoRecords.size() - 1;
+  m_iCurRecord = pdfium::CollectionSize<int32_t>(m_DoRecords) - 1;
   return m_iCurRecord;
 }
 void CFWL_EditImp::Layout() {
   GetClientRect(m_rtClient);
   m_rtEngine = m_rtClient;
   FX_FLOAT* pfWidth = static_cast<FX_FLOAT*>(
       GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
   if (!pfWidth)
     return;
   FX_FLOAT fWidth = *pfWidth;
@@ skipping 698 matching lines @@
     }
     CFX_RectF rect;
     m_pOwner->GetWidgetRect(rect);
     CFX_RectF rtInvalidate;
     rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
     m_pOwner->Repaint(&rtInvalidate);
   }
   return TRUE;
 }
 void CFWL_EditImpDelegate::DoCursor(CFWL_MsgMouse* pMsg) {}