Clean up to move NewStringCopy from util to chromoes/string.

src/common/util.cc

Index: src/common/util.cc
diff --git a/src/common/util.cc b/src/common/util.cc
deleted file mode 100644
index b77200945a27a8a48ad7e425227f4e813ee18111..0000000000000000000000000000000000000000
--- a/src/common/util.cc
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <cstdlib>
-#include <cstring>
-
-char* NewStringCopy(const char* x) {
-  char* result = static_cast<char*>(std::malloc(std::strlen(x) + 1));
-  std::strcpy(result, x);  // NOLINT
-  return result;
-}