Move MetricsStateManager into the Metrics component.

components/metrics/metrics_switches.cc

Index: components/metrics/metrics_switches.cc
diff --git a/components/metrics/metrics_switches.cc b/components/metrics/metrics_switches.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1aef619d6a4a9a56e03cca597d058536f8289dd1
--- /dev/null
+++ b/components/metrics/metrics_switches.cc
@@ -0,0 +1,15 @@
+// Copyright 2014 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 "components/metrics/metrics_switches.h"
+
+namespace metrics {
+namespace switches {
+
+// Forces a reset of the one-time-randomized FieldTrials on this client, also
+// known as the Chrome Variations state.
+const char kResetVariationState[] = "reset-variation-state";
+
+}  // namespace switches
+}  // namespace metrics