[MD settings] lighter weight initializer for protocol handler enabled messages

chrome/browser/ui/webui/settings/protocol_handlers_handler.cc

Index: chrome/browser/ui/webui/settings/protocol_handlers_handler.cc
diff --git a/chrome/browser/ui/webui/settings/protocol_handlers_handler.cc b/chrome/browser/ui/webui/settings/protocol_handlers_handler.cc
index 2e9c467140353b24c3a7ced2f1d6e7c56bda7386..8ede9b3f6a2a86dc37fbd0b5b4c9b4ff3d1455cb 100644
--- a/chrome/browser/ui/webui/settings/protocol_handlers_handler.cc
+++ b/chrome/browser/ui/webui/settings/protocol_handlers_handler.cc
@@ -40,9 +40,13 @@ void ProtocolHandlersHandler::OnJavascriptDisallowed() {
 }
 
 void ProtocolHandlersHandler::RegisterMessages() {
-  web_ui()->RegisterMessageCallback("initializeProtocolHandlerList",
-      base::Bind(&ProtocolHandlersHandler::HandleInitializeList,
+  web_ui()->RegisterMessageCallback("observeProtocolHandlers",
+      base::Bind(&ProtocolHandlersHandler::HandleObserveProtocolHandlers,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("observeProtocolHandlersEnabledState",
+      base::Bind(
+          &ProtocolHandlersHandler::HandleObserveProtocolHandlersEnabledState,
+          base::Unretained(this)));
   web_ui()->RegisterMessageCallback("clearDefault",
       base::Bind(&ProtocolHandlersHandler::HandleClearDefault,
                  base::Unretained(this)));
@@ -131,13 +135,19 @@ void ProtocolHandlersHandler::UpdateHandlerList() {
                          *ignored_handlers);
 }
 
-void ProtocolHandlersHandler::HandleInitializeList(
+void ProtocolHandlersHandler::HandleObserveProtocolHandlers(
     const base::ListValue* args) {
   AllowJavascript();
   SendHandlersEnabledValue();
   UpdateHandlerList();
 }
 
+void ProtocolHandlersHandler::HandleObserveProtocolHandlersEnabledState(
+    const base::ListValue* args) {
+  AllowJavascript();
+  SendHandlersEnabledValue();
+}
+
 void ProtocolHandlersHandler::SendHandlersEnabledValue() {
   CallJavascriptFunction("cr.webUIListenerCallback",
                          base::StringValue("setHandlersEnabled"),