Add namespace and re-arrange PDFium's local copy of chromium /base.

core/src/fxcrt/fx_basic_bstring.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 "../../include/fxcrt/fx_basic.h"
-#include "../../../third_party/numerics/safe_math.h"
+#include "../../../third_party/base/numerics/safe_math.h"
 
 static int _Buffer_itoa(char* buf, int i, FX_DWORD flags)
 {
     if (i == 0) {
         buf[0] = '0';
         return 1;
     }
     char buf1[32];
     int buf_pos = 31;
     FX_DWORD u = i;
@@ skipping 26 matching lines @@
     char buf[32];
     return CFX_ByteStringC(buf, _Buffer_itoa(buf, i, flags));
 }
 static CFX_StringData* FX_AllocString(int nLen)
 {
     // |nLen| is currently declared as in |int|. TODO(palmer): It should be
     // a |size_t|, or at least unsigned.
     if (nLen == 0 || nLen < 0) {
         return NULL;
     }
-    base::CheckedNumeric<int> nSize = nLen;
+    pdfium::base::CheckedNumeric<int> nSize = nLen;
     nSize += sizeof(long) * 3 + 1;
     CFX_StringData* pData = (CFX_StringData*)FX_Alloc(FX_BYTE, nSize.ValueOrDie());
     if (!pData) {
         return NULL;
     }
     pData->m_nAllocLength = nLen;
     pData->m_nDataLength = nLen;
     pData->m_nRefs = 1;
     pData->m_String[nLen] = 0;
     return pData;
@@ skipping 1103 matching lines @@
     FX_CHAR* pBuffer = (FX_CHAR*)(this + 1);
     FXSYS_memcpy32(pBuffer + m_Size, str.GetPtr(), len);
     m_Size += len;
 }
 void CFX_StringBufBase::Append(int i, FX_DWORD flags)
 {
     char buf[32];
     int len = _Buffer_itoa(buf, i, flags);
     Append(CFX_ByteStringC(buf, len));
 }