Remove more lint, mostly C-style casts.

Change-Id: Iaf1f23290e35ed48e5795fb20690953a9a834457
diff --git a/src/object.cc b/src/object.cc
index f72dc28..207a175 100644
--- a/src/object.cc
+++ b/src/object.cc
@@ -1470,7 +1470,7 @@
 std::string String::ToModifiedUtf8() const {
   const uint16_t* chars = GetCharArray()->GetData() + GetOffset();
   size_t byte_count(CountUtf8Bytes(chars, GetLength()));
-  std::string result(byte_count, char(0));
+  std::string result(byte_count, static_cast<char>(0));
   ConvertUtf16ToModifiedUtf8(&result[0], chars, GetLength());
   return result;
 }