Add a new method to the ProfileInfoCacheObserver for signin status changes.

chrome/browser/profiles/profile_info_cache.cc

Index: chrome/browser/profiles/profile_info_cache.cc
diff --git a/chrome/browser/profiles/profile_info_cache.cc b/chrome/browser/profiles/profile_info_cache.cc
index 952a1f22b471c86037f02d04fe0c1f9bfe42de4b..989016dbd9152f4478d1f623c26160d6ad26f984 100644
--- a/chrome/browser/profiles/profile_info_cache.cc
+++ b/chrome/browser/profiles/profile_info_cache.cc
@@ -707,6 +707,11 @@ void ProfileInfoCache::SetProfileSigninRequiredAtIndex(size_t index,
   info->SetBoolean(kSigninRequiredKey, value);
   // This takes ownership of |info|.
   SetInfoForProfileAtIndex(index, info.release());
+
+  base::FilePath profile_path = GetPathOfProfileAtIndex(index);
+  FOR_EACH_OBSERVER(ProfileInfoCacheObserver,
+                    observer_list_,
+                    OnProfileSigninRequiredChanged(profile_path));
 }
 
 void ProfileInfoCache::SetProfileIsEphemeralAtIndex(size_t index, bool value) {