Move tracked prefs into services/preferences/tracked.

components/user_prefs/tracked/tracked_preference_histogram_names.h

Index: components/user_prefs/tracked/tracked_preference_histogram_names.h
diff --git a/components/user_prefs/tracked/tracked_preference_histogram_names.h b/components/user_prefs/tracked/tracked_preference_histogram_names.h
deleted file mode 100644
index 31b9ce30448d80e3bcdac0cfd2e2bd507cfb2912..0000000000000000000000000000000000000000
--- a/components/user_prefs/tracked/tracked_preference_histogram_names.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2015 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_USER_PREFS_TRACKED_TRACKED_PREFERENCE_HISTOGRAM_NAMES_H_
-#define COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_HISTOGRAM_NAMES_H_
-
-namespace user_prefs {
-namespace tracked {
-
-extern const char kTrackedPrefHistogramUnchanged[];
-extern const char kTrackedPrefHistogramCleared[];
-extern const char kTrackedPrefHistogramMigratedLegacyDeviceId[];
-extern const char kTrackedPrefHistogramChanged[];
-extern const char kTrackedPrefHistogramInitialized[];
-extern const char kTrackedPrefHistogramTrustedInitialized[];
-extern const char kTrackedPrefHistogramNullInitialized[];
-extern const char kTrackedPrefHistogramWantedReset[];
-extern const char kTrackedPrefHistogramReset[];
-extern const char kTrackedSplitPrefHistogramChanged[];
-extern const char kTrackedPrefRegistryValidationSuffix[];
-
-}  // namespace tracked
-}  // namespace user_prefs
-
-#endif  // COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_HISTOGRAM_NAMES_H_