diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/string16.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/string16.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+// Copyright (c) 2006-2008 The Chromium 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 "base/string16.h"
+
+#if defined(WCHAR_T_IS_UTF16)
+
+#error This file should not be used on 2-byte wchar_t systems
+// If this winds up being needed on 2-byte wchar_t systems, either the
+// definitions below can be used, or the host system's wide character
+// functions like wmemcmp can be wrapped.
+
+#elif defined(WCHAR_T_IS_UTF32)
+
+#include "base/string_util.h"
+
+namespace base {
+
+int c16memcmp(const char16* s1, const char16* s2, size_t n) {
+  // We cannot call memcmp because that changes the semantics.
+  while (n-- > 0) {
+    if (*s1 != *s2) {
+      // We cannot use (*s1 - *s2) because char16 is unsigned.
+      return ((*s1 < *s2) ? -1 : 1);
+    }
+    ++s1;
+    ++s2;
+  }
+  return 0;
+}
+
+size_t c16len(const char16* s) {
+  const char16 *s_orig = s;
+  while (*s) {
+    ++s;
+  }
+  return s - s_orig;
+}
+
+const char16* c16memchr(const char16* s, char16 c, size_t n) {
+  while (n-- > 0) {
+    if (*s == c) {
+      return s;
+    }
+    ++s;
+  }
+  return 0;
+}
+
+char16* c16memmove(char16* s1, const char16* s2, size_t n) {
+  return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
+}
+
+char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
+  return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
+}
+
+char16* c16memset(char16* s, char16 c, size_t n) {
+  char16 *s_orig = s;
+  while (n-- > 0) {
+    *s = c;
+    ++s;
+  }
+  return s_orig;
+}
+
+}  // namespace base
+
+template class std::basic_string<char16, base::string16_char_traits>;
+
+#endif  // WCHAR_T_IS_UTF32