Make the hcsm and its providers communicate via an observer interface.

chrome/browser/content_settings/content_settings_mock_observer.cc

Index: chrome/browser/content_settings/content_settings_mock_observer.cc
diff --git a/chrome/browser/content_settings/content_settings_mock_observer.cc b/chrome/browser/content_settings/content_settings_mock_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8d898c470f6d6775da1b572db46e0e3b984c16fb
--- /dev/null
+++ b/chrome/browser/content_settings/content_settings_mock_observer.cc
@@ -0,0 +1,15 @@
+// Copyright (c) 2011 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.
+
+#include "chrome/browser/content_settings/content_settings_mock_observer.h"
+
+namespace content_settings {
+
+MockObserver::MockObserver() {
+}
+
+MockObserver::~MockObserver()  {
+}
+
+}  // namespace content_settings