Fix all relative includes to third_party.

core/src/fxcodec/jbig2/JBig2_SymbolDict.h

 // 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
 
 #ifndef CORE_SRC_FXCODEC_JBIG2_JBIG2_SYMBOLDICT_H_
 #define CORE_SRC_FXCODEC_JBIG2_JBIG2_SYMBOLDICT_H_
 
 #include <vector>
 
-#include "../../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../../include/fxcrt/fx_basic.h"
 #include "JBig2_ArithDecoder.h"
 #include "JBig2_List.h"
+#include "third_party/base/nonstd_unique_ptr.h"
 
 class CJBig2_Image;
 
 class CJBig2_SymbolDict {
  public:
   CJBig2_SymbolDict();
   ~CJBig2_SymbolDict();
 
   nonstd::unique_ptr<CJBig2_SymbolDict> DeepCopy() const;
 
@@ skipping 13 matching lines @@
     m_grContext = grContext;
   }
 
  private:
   std::vector<JBig2ArithCtx> m_gbContext;
   std::vector<JBig2ArithCtx> m_grContext;
   CJBig2_List<CJBig2_Image> m_SDEXSYMS;
 };
 
 #endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_SYMBOLDICT_H_