Replace more ObserverList with base::ObserverList.

net/android/network_change_notifier_android_unittest.cc

Index: net/android/network_change_notifier_android_unittest.cc
diff --git a/net/android/network_change_notifier_android_unittest.cc b/net/android/network_change_notifier_android_unittest.cc
index 30ee4f0795e39930ee8b5fa58c07d7b0f15f34df..8c63d8163f72be68502edc177a4c24a22321eaba 100644
--- a/net/android/network_change_notifier_android_unittest.cc
+++ b/net/android/network_change_notifier_android_unittest.cc
@@ -123,7 +123,8 @@ class BaseNetworkChangeNotifierAndroidTest : public testing::Test {
 
   void SetOnline() {
     delegate_.SetOnline();
-    // Note that this is needed because ObserverListThreadSafe uses PostTask().
+    // Note that this is needed because base::ObserverListThreadSafe uses
+    // PostTask().
     base::MessageLoop::current()->RunUntilIdle();
   }