test IWYU fixups for base

These are some of the suggestions from running include-what-you-use[1]
on the base target.

[1] https://code.google.com/p/include-what-you-use/

BUG=259043

Review URL: https://chromiumcodereview.appspot.com/23540009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221067 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/vlog.cc b/base/vlog.cc
index 9465054..434a70e0 100644
--- a/base/vlog.cc
+++ b/base/vlog.cc
@@ -4,6 +4,10 @@
 
 #include "base/vlog.h"
 
+#include <cstddef>
+#include <ostream>
+#include <utility>
+
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"