Improve error messaging of webRequest API in case of conflicts

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
index 32e6243f5c2462be9fa809636a8e3d418036a0ea..dce4ed5d780e8eb9d1619b00481ee56911085b18 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
@@ -67,6 +67,7 @@ using content::RenderViewHost;
 using content::WebContents;
 using extensions::Extension;
 using extensions::ExtensionUpdater;
+using extensions::ExtensionWarning;
 using extensions::ManagementPolicy;
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -90,6 +91,13 @@ ExtensionSettingsHandler::~ExtensionSettingsHandler() {
     load_extension_dialog_->ListenerDestroyed();
 
   registrar_.RemoveAll();
+
+  if (registered_for_notifications_) {
+    Profile* profile = Profile::FromWebUI(web_ui());
+    extensions::ExtensionWarningService* warning_service =
+        extensions::ExtensionSystem::Get(profile)->warning_service();
+    warning_service->RemoveObserver(this);
+  }
 }
 
 ExtensionSettingsHandler::ExtensionSettingsHandler(ExtensionService* service,
@@ -111,7 +119,7 @@ void ExtensionSettingsHandler::RegisterUserPrefs(PrefService* prefs) {
 DictionaryValue* ExtensionSettingsHandler::CreateExtensionDetailValue(
     const Extension* extension,
     const std::vector<ExtensionPage>& pages,
-    const ExtensionWarningSet* warnings_set) {
+    const extensions::ExtensionWarningService* warning_service) {
   DictionaryValue* extension_data = new DictionaryValue();
   bool enabled = extension_service_->IsExtensionEnabled(extension->id());
   extension->GetBasicInfo(enabled, extension_data);
@@ -183,19 +191,15 @@ DictionaryValue* ExtensionSettingsHandler::CreateExtensionDetailValue(
       extension_action_manager->GetPageAction(*extension));
 
   // Add warnings.
-  if (warnings_set) {
-    std::set<ExtensionWarningSet::WarningType> warnings;
-    warnings_set->GetWarningsAffectingExtension(extension->id(), &warnings);
+  if (warning_service) {
+    std::vector<std::string> warnings;
+    warning_service->GetWarningMessagesForExtension(extension->id(), &warnings);
 
     if (!warnings.empty()) {
       ListValue* warnings_list = new ListValue;
-      for (std::set<ExtensionWarningSet::WarningType>::const_iterator iter =
-               warnings.begin();
-           iter != warnings.end();
-           ++iter) {
-        string16 warning_string(
-            ExtensionWarningSet::GetLocalizedWarning(*iter));
-        warnings_list->Append(Value::CreateStringValue(warning_string));
+      for (std::vector<std::string>::const_iterator iter = warnings.begin();
+           iter != warnings.end(); ++iter) {
+        warnings_list->Append(Value::CreateStringValue(*iter));
       }
       extension_data->Set("warnings", warnings_list);
     }
@@ -419,7 +423,6 @@ void ExtensionSettingsHandler::Observe(
     case chrome::NOTIFICATION_EXTENSION_LOADED:
     case chrome::NOTIFICATION_EXTENSION_UNLOADED:
     case chrome::NOTIFICATION_EXTENSION_UPDATE_DISABLED:
-    case chrome::NOTIFICATION_EXTENSION_WARNING_CHANGED:
     case chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_VISIBILITY_CHANGED:
     case chrome::NOTIFICATION_PREF_CHANGED:
       MaybeUpdateAfterNotification();
@@ -461,6 +464,10 @@ void ExtensionSettingsHandler::ExtensionUninstallCanceled() {
   extension_id_prompting_ = "";
 }
 
+void ExtensionSettingsHandler::ExtensionWarningsChanged() {
+  MaybeUpdateAfterNotification();
+}
+
 void ExtensionSettingsHandler::ReloadUnpackedExtensions() {
   const ExtensionSet* extensions = extension_service_->extensions();
   std::vector<const Extension*> unpacked_extensions;
@@ -480,10 +487,13 @@ void ExtensionSettingsHandler::HandleRequestExtensionsData(
     const ListValue* args) {
   DictionaryValue results;
 
+  Profile* profile = Profile::FromWebUI(web_ui());
+
   // Add the extensions to the results structure.
   ListValue *extensions_list = new ListValue();
 
-  ExtensionWarningSet* warnings = extension_service_->extension_warnings();
+  extensions::ExtensionWarningService* warnings =
+      extensions::ExtensionSystem::Get(profile)->warning_service();
 
   const ExtensionSet* extensions = extension_service_->extensions();
   for (ExtensionSet::const_iterator extension = extensions->begin();
@@ -523,10 +533,10 @@ void ExtensionSettingsHandler::HandleRequestExtensionsData(
     results.SetBoolean("developerMode", false);
   } else {
     results.SetBoolean("managedMode", false);
-  Profile* profile = Profile::FromWebUI(web_ui());
-  bool developer_mode =
-      profile->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode);
-  results.SetBoolean("developerMode", developer_mode);
+
+    bool developer_mode =
+        profile->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode);
+    results.SetBoolean("developerMode", developer_mode);
   }
 
   bool load_unpacked_disabled =
@@ -787,8 +797,6 @@ void ExtensionSettingsHandler::MaybeRegisterForNotifications() {
                  content::Source<Profile>(profile));
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UPDATE_DISABLED,
                  content::Source<Profile>(profile));
-  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_WARNING_CHANGED,
-                 content::Source<Profile>(profile));
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this,
@@ -809,6 +817,10 @@ void ExtensionSettingsHandler::MaybeRegisterForNotifications() {
       content::Source<extensions::ExtensionPrefs>(
           profile->GetExtensionService()->extension_prefs()));
 
+  extensions::ExtensionWarningService* warning_service =
+      extensions::ExtensionSystem::Get(profile)->warning_service();
+  warning_service->AddObserver(this);
+
   pref_registrar_.Init(profile->GetPrefs());
   pref_registrar_.Add(prefs::kExtensionInstallDenyList, this);
   local_state_pref_registrar_.Init(g_browser_process->local_state());