Move MetricsStateManager into the Metrics component.

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 33969aaf631aae482474aa6f8ae5bfbc036b88c9..7d09eefd216b824ca06a506f1543a961667a0a71 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -677,7 +677,7 @@ void BrowserProcessImpl::RegisterPrefs(PrefRegistrySimple* registry) {
 #endif  // defined(OS_CHROMEOS)
 #if !defined(OS_CHROMEOS)
   registry->RegisterBooleanPref(
-      prefs::kMetricsReportingEnabled,
+      metrics::prefs::kMetricsReportingEnabled,
       GoogleUpdateSettings::GetCollectStatsConsent());
 #endif  // !defined(OS_CHROMEOS)
 
@@ -847,7 +847,7 @@ void BrowserProcessImpl::CreateLocalState() {
   // whenever the preference or its controlling policy changes.
 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID) && !defined(OS_IOS)
   pref_change_registrar_.Add(
-      prefs::kMetricsReportingEnabled,
+      metrics::prefs::kMetricsReportingEnabled,
       base::Bind(&BrowserProcessImpl::ApplyMetricsReportingPolicy,
                  base::Unretained(this)));
 #endif
@@ -1012,7 +1012,8 @@ void BrowserProcessImpl::ApplyMetricsReportingPolicy() {
       BrowserThread::FILE, FROM_HERE,
       base::Bind(
           base::IgnoreResult(&GoogleUpdateSettings::SetCollectStatsConsent),
-          local_state()->GetBoolean(prefs::kMetricsReportingEnabled))));
+          local_state()->GetBoolean(
+              metrics::prefs::kMetricsReportingEnabled))));
 #endif
 }