Create variations target that depends on base.

components/variations/entropy_provider.cc

Index: components/variations/entropy_provider.cc
===================================================================
--- components/variations/entropy_provider.cc	(working copy)
+++ components/variations/entropy_provider.cc	(working copy)
@@ -1,8 +1,8 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2013 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 "chrome/common/metrics/entropy_provider.h"
+#include "components/variations/entropy_provider.h"
 
 #include <algorithm>
 #include <limits>
@@ -12,7 +12,7 @@
 #include "base/rand_util.h"
 #include "base/sha1.h"
 #include "base/sys_byteorder.h"
-#include "chrome/common/metrics/metrics_util.h"
+#include "components/variations/metrics_util.h"
 
 namespace metrics {