Move base::va_copy from a function to a macro.

base/string_util_unittest.cc

Index: base/string_util_unittest.cc
diff --git a/base/string_util_unittest.cc b/base/string_util_unittest.cc
index 496895042a294b604d6b158fea99aa818152cdd1..35c58d6668ac805a643244721ac1e13a59b9b35b 100644
--- a/base/string_util_unittest.cc
+++ b/base/string_util_unittest.cc
@@ -1302,7 +1302,7 @@ static void VariableArgsFunc(const char* format, ...) {
   va_start(org, format);
 
   va_list dup;
-  base::va_copy(dup, org);
+  GG_VA_COPY(dup, org);
   int i1 = va_arg(org, int);
   int j1 = va_arg(org, int);
   char* s1 = va_arg(org, char*);