Simplify the Observer pattern used in the BrowserList.

base/observer_list.h

Index: base/observer_list.h
diff --git a/base/observer_list.h b/base/observer_list.h
index 0b4c583ec77c1700aa8daf68ead78e27167b2c33..10c6775165a9c7abcb0fb6efe4d03a3da8792b40 100644
--- a/base/observer_list.h
+++ b/base/observer_list.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -149,11 +149,9 @@ class ObserverListBase {
     }
   }
 
- protected:
-  size_t size() const {
-    return observers_.size();
-  }
+  size_t size() const { return observers_.size(); }
 
+ protected:
   void Compact() {
     typename ListType::iterator it = observers_.begin();
     while (it != observers_.end()) {