Replace more ObserverList with base::ObserverList.

components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc

Index: components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc
diff --git a/components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc b/components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc
index e081e848d33b1785426b2464d97774d56f67e83b..5175745f4941b5608be2a1962efbceb655a096ff 100644
--- a/components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc
+++ b/components/password_manager/core/browser/affiliation_fetch_throttler_unittest.cc
@@ -120,7 +120,8 @@ class AffiliationFetchThrottlerTest : public testing::Test {
   }
 
  private:
-  // Needed because NetworkChangeNotifier uses ObserverList, which notifies
+  // Needed because NetworkChangeNotifier uses base::ObserverList, which
+  // notifies
   // observers on the MessageLoop that belongs to the thread from which they
   // have registered.
   base::MessageLoop message_loop_;