Remove migration of obsolete value for "session.restore_on_startup".

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 48999c7cbfa2864d426975dbca233422a40a5219..98b8d06522d2161ef5336864dbabea9ca68d9a67 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -233,15 +233,14 @@ const char kShownAutoLaunchInfobarDeprecated[] =
     "browser.shown_autolaunch_infobar";
 #endif  // defined(OS_WIN)
 
-// The SessionStartupPref used this pref to store the list of URLs to restore
-// on startup, and then renamed it to "sessions.startup_urls" in M31. Migration
-// code was added and the timestamp of when the migration happened was tracked
-// by "session.startup_urls_migration_time". Both are obsolete now (2015/09) and
-// should be removed once a few releases have happened.
+// Deprecated 12/2015.

[gab, 2015/12/02 21:27:18]

This comment change belongs on your other CL I think.

[sdefresne, 2015/12/03 10:28:33]

Ack, removed.

 const char kURLsToRestoreOnStartupOld[] = "session.urls_to_restore_on_startup";
 const char kRestoreStartupURLsMigrationTime[] =
   "session.startup_urls_migration_time";
 
+// Deprecated 12/2015.
+const char kRestoreOnStartupMigrated[] = "session.restore_on_startup_migrated";
+
 }  // namespace
 
 namespace chrome {
@@ -530,6 +529,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 
   registry->RegisterListPref(kURLsToRestoreOnStartupOld);
   registry->RegisterInt64Pref(kRestoreStartupURLsMigrationTime, 0);
+  registry->RegisterBooleanPref(kRestoreOnStartupMigrated, false);
 }
 
 void RegisterUserProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
@@ -581,6 +581,9 @@ void MigrateObsoleteProfilePrefs(Profile* profile) {
   // Added 12/1015.
   profile_prefs->ClearPref(kURLsToRestoreOnStartupOld);
   profile_prefs->ClearPref(kRestoreStartupURLsMigrationTime);
+
+  // Added 12/2015.
+  profile_prefs->ClearPref(kRestoreOnStartupMigrated);
 }
 
 }  // namespace chrome