Make code compile with clang_use_chrome_plugin (part II)

core/fxcrt/fx_basic_util.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 "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_ext.h"
 
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
@@ skipping 99 matching lines @@
 }
 #endif  // _FXM_PLATFORM_WINDOWS_ && _MSC_VER < 1900
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 class CFindFileData {
  public:
   virtual ~CFindFileData() {}
   HANDLE m_Handle;
   FX_BOOL m_bEnd;
 };
+
 class CFindFileDataA : public CFindFileData {
  public:
-  virtual ~CFindFileDataA() {}
+  ~CFindFileDataA() override {}
   WIN32_FIND_DATAA m_FindData;
 };
+
 class CFindFileDataW : public CFindFileData {
  public:
-  virtual ~CFindFileDataW() {}
+  ~CFindFileDataW() override {}
   WIN32_FIND_DATAW m_FindData;
 };
 #endif
 
 void* FX_OpenFolder(const FX_CHAR* path) {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   std::unique_ptr<CFindFileDataA> pData(new CFindFileDataA);
   pData->m_Handle = FindFirstFileExA((CFX_ByteString(path) + "/*.*").c_str(),
                                      FindExInfoStandard, &pData->m_FindData,
                                      FindExSearchNameMatch, nullptr, 0);
@@ skipping 152 matching lines @@
     dstShift -= 8;
     result |= *dataPtr++ << dstShift;
   }
   if (dstShift > 0) {
     bitShift = 8 - dstShift;
     bitMask = (1 << dstShift) - 1;
     result |= *dataPtr++ >> bitShift & bitMask;
   }
   return result;
 }