Move MetricsStateManager into the Metrics component.

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
 
 #include "build/build_config.h"
 
 #include "components/autofill/core/common/autofill_pref_names.h"
 #include "components/bookmarks/common/bookmark_pref_names.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
+#include "components/metrics/metrics_pref_names.h"
 #include "components/signin/core/common/signin_pref_names.h"
 
 namespace prefs {
 
 // Profile prefs. Please add Local State prefs below instead.
 extern const char kDefaultApps[];
 extern const char kDefaultAppsInstalled[];
 extern const char kDisableScreenshots[];
 extern const char kHomePageIsNewTabPage[];
 extern const char kHomePage[];
@@ skipping 391 matching lines @@
 extern const char kSSLVersionMax[];
 extern const char kCipherSuiteBlacklist[];
 extern const char kDisableSSLRecordSplitting[];
 
 extern const char kGLVendorString[];
 extern const char kGLRendererString[];
 extern const char kGLVersionString[];
 
 extern const char kEulaAccepted[];
 
-extern const char kMetricsClientID[];
-extern const char kMetricsSessionID[];
-extern const char kMetricsLowEntropySource[];
-extern const char kMetricsOldClientID[];
-extern const char kMetricsOldLowEntropySource[];
 extern const char kMetricsReportingEnabled[];
-extern const char kMetricsReportingEnabledTimestamp[];
+
 // Android has it's own metric / crash reporting implemented in Android
 // Java code so kMetricsReportingEnabled doesn't make sense. We use this
 // to inform crashes_ui that we have enabled crash reporting.
 #if defined(OS_ANDROID)
 extern const char kCrashReportingEnabled[];
 #endif
 
 extern const char kVariationsLastFetchTime[];
 extern const char kVariationsRestrictParameter[];
 extern const char kVariationsSeed[];
@@ skipping 429 matching lines @@
 
 #if defined(OS_ANDROID)
 extern const char kPartnerBookmarkMappings[];
 #endif
 
 extern const char kQuickCheckEnabled[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_