Extract kArcEnabled preference from ArcSessionManager part 1.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index a6f312579bf1e2d3b42d98bc1446d0f4db972ade..77ed648fea03d2ef605041a0f4cc088d39a89737 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -28,7 +28,8 @@ const char kArcDataRemoveRequested[] = "arc.data.remove_requested";
 // Store on ARC.
 // TODO(hidehiko): For historical reason, now the preference name does not
 // directly reflect "Google Play Store". We should get and set the values via
-// utility methods (IsArcPlayStoreEnabled() and SetArcPlayStoreEnabled()).
+// utility methods (IsArcPlayStoreEnabledForProfile() and
+// SetArcPlayStoreEnabledForProfile()) in chrome/browser/chromeos/arc/arc_util.
 const char kArcEnabled[] = "arc.enabled";
 // A preference that indicated whether Android reported that it's compliant
 // with provided policies. When it's compliant, Android kiosk app will start.