Make code compile with clang_use_chrome_plugin (part II)

core/fxcrt/fx_bidi.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/fx_bidi.h"
 #include "core/fxcrt/include/fx_ucd.h"
 
 #include <algorithm>
@@ skipping 55 matching lines @@
 
   size_t nL2R = std::count_if(m_Order.begin(), m_Order.end(),
                               [](const CFX_BidiChar::Segment& seg) {
                                 return seg.direction == CFX_BidiChar::LEFT;
                               });
 
   if (nR2L > 0 && nR2L >= nL2R)
     SetOverallDirectionRight();
 }
 
+CFX_BidiString::~CFX_BidiString() {}
+
 void CFX_BidiString::SetOverallDirectionRight() {
   if (m_eOverallDirection != CFX_BidiChar::RIGHT) {
     std::reverse(m_Order.begin(), m_Order.end());
     m_eOverallDirection = CFX_BidiChar::RIGHT;
   }
 }