Replace math.h with cmath

src/json-stringifier.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 504 matching lines @@
   static const int kBufferSize = 100;
   char chars[kBufferSize];
   Vector<char> buffer(chars, kBufferSize);
   AppendAscii(IntToCString(object->value(), buffer));
   return SUCCESS;
 }
 
 
 BasicJsonStringifier::Result BasicJsonStringifier::SerializeDouble(
     double number) {
-  if (isinf(number) || isnan(number)) {
+  if (std::isinf(number) || std::isnan(number)) {
     AppendAscii("null");
     return SUCCESS;
   }
   static const int kBufferSize = 100;
   char chars[kBufferSize];
   Vector<char> buffer(chars, kBufferSize);
   AppendAscii(DoubleToCString(number, buffer));
   return SUCCESS;
 }
 
@@ skipping 303 matching lines @@
       SerializeString_<false, uint8_t>(object);
     } else {
       SerializeString_<false, uc16>(object);
     }
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_STRINGIFIER_H_