Modified PolicyService to register observers by domain only, instead of domain and component.

chrome/browser/ui/webui/policy_ui.cc

Index: chrome/browser/ui/webui/policy_ui.cc
diff --git a/chrome/browser/ui/webui/policy_ui.cc b/chrome/browser/ui/webui/policy_ui.cc
index 3af9974254a4151688523b49467677a1c2c9f84a..9eebb593fd215722b814ae17401c6b41e2bf69fc 100644
--- a/chrome/browser/ui/webui/policy_ui.cc
+++ b/chrome/browser/ui/webui/policy_ui.cc
@@ -171,13 +171,11 @@ PolicyUIHandler::PolicyUIHandler()
     : ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}
 
 PolicyUIHandler::~PolicyUIHandler() {
-  GetPolicyService()->RemoveObserver(
-      policy::POLICY_DOMAIN_CHROME, "", this);
+  GetPolicyService()->RemoveObserver(policy::POLICY_DOMAIN_CHROME, this);
 }
 
 void PolicyUIHandler::RegisterMessages() {
-  GetPolicyService()->AddObserver(
-      policy::POLICY_DOMAIN_CHROME, "", this);
+  GetPolicyService()->AddObserver(policy::POLICY_DOMAIN_CHROME, this);
   web_ui()->RegisterMessageCallback(
       "requestData",
       base::Bind(&PolicyUIHandler::HandleRequestData,