Pull the new r369476 of base library from Chromium

The merge was done against r369476 which corresponds to git commit
0471d0e2e2ef4a544a63481a389e1df33ea7c00a of Jan 14, 2016

Change-Id: Ie6894cf65424cc5ad115110faccd51602b2d1234
Reviewed-on: https://weave-review.googlesource.com/2225
Reviewed-by: Alex Vakulenko <avakulenko@google.com>
diff --git a/third_party/chromium/base/strings/string_util_posix.h b/third_party/chromium/base/strings/string_util_posix.h
index ccfff10..07a89e4 100644
--- a/third_party/chromium/base/strings/string_util_posix.h
+++ b/third_party/chromium/base/strings/string_util_posix.h
@@ -6,6 +6,7 @@
 #define BASE_STRINGS_STRING_UTIL_POSIX_H_
 
 #include <stdarg.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <wchar.h>
@@ -18,7 +19,6 @@
                      const char* format, va_list arguments) {
   return ::vsnprintf(buffer, size, format, arguments);
 }
-
 }  // namespace base
 
 #endif  // BASE_STRINGS_STRING_UTIL_POSIX_H_