Add Observer in FaviconTabHelper

chrome/browser/favicon/favicon_tab_helper_observer.cc

Index: chrome/browser/favicon/favicon_tab_helper_observer.cc
diff --git a/chrome/test/data/extensions/policy_shared_module/shared_module/pass.js b/chrome/browser/favicon/favicon_tab_helper_observer.cc
similarity index 58%
copy from chrome/test/data/extensions/policy_shared_module/shared_module/pass.js
copy to chrome/browser/favicon/favicon_tab_helper_observer.cc
index 2a344be5ca53dc39b0cd7a89c66d67ce05122c7c..56b6d4a55c59a3f383387fb9a72b50a272985fbf 100644
--- a/chrome/test/data/extensions/policy_shared_module/shared_module/pass.js
+++ b/chrome/browser/favicon/favicon_tab_helper_observer.cc
@@ -2,4 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var pass_exported = {};
+#include "chrome/browser/favicon/favicon_tab_helper_observer.h"
+
+FaviconTabHelperObserver::~FaviconTabHelperObserver() {
+}