Fix relative includes within core/

core/src/fxcodec/jbig2/JBig2_List.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_LIST_H_
 #define CORE_SRC_FXCODEC_JBIG2_JBIG2_LIST_H_
 
+#include <stdlib.h>
+
 #include <vector>
 
 // A poor man's ScopedVector for pointers of TYPE.
 // Owns all the pointers contained within and deletes them on destruction.
 template <class TYPE>
 class CJBig2_List {
  public:
   CJBig2_List() {}
   explicit CJBig2_List(size_t count) { resize(count); }
 
@@ skipping 25 matching lines @@
     for (size_t i = count; i < size(); ++i)
       delete m_vector[i];
     m_vector.resize(count);
   }
 
  private:
   std::vector<TYPE*> m_vector;
 };
 
 #endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_LIST_H_