Move MetricsStateManager into the Metrics component.

components/metrics/metrics_switches.h

Index: components/metrics/metrics_switches.h
diff --git a/components/metrics/metrics_switches.h b/components/metrics/metrics_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..b3fe7fd9c03ead1d9bbaa1d6bf5eb3ec4ce43d99
--- /dev/null
+++ b/components/metrics/metrics_switches.h
@@ -0,0 +1,18 @@
+// 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.
+
+#ifndef COMPONENTS_METRICS_METRICS_SWITCHES_H_
+#define COMPONENTS_METRICS_METRICS_SWITCHES_H_
+
+namespace metrics {
+namespace switches {
+
+// Alphabetical list of switches specific to the metrics component. Document
+// each in the .cc file.
+extern const char kResetVariationState[];
+
+}  // namespace switches
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_METRICS_SWITCHES_H_