Review and cleanup lint warnings.

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 <stddef.h>  // For offsetof().
+#include <stddef.h>
+
 #include <cctype>
+#include <string>

[Tom Sepez, 2016/03/08 19:27:05]

There aren't any std::strings in the core PDFium code.  Variable rename?

[dsinclair, 2016/03/08 21:08:02]

Done.

 
 #include "core/include/fxcrt/fx_basic.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];
@@ skipping 1060 matching lines @@
     fraction %= scale;
     scale /= 10;
   }
   return buf_size;
 }
 CFX_ByteString CFX_ByteString::FormatFloat(FX_FLOAT d, int precision) {
   FX_CHAR buf[32];
   FX_STRSIZE len = FX_ftoa(d, buf);
   return CFX_ByteString(buf, len);
 }