[Extensions] Update Error Console UI

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index 47e5e9383f54a7240a4a2a622bef60c65fcebef3..b7757fa8730c523f517374ae9d744aeb67f40e05 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -308,13 +308,23 @@ void DeveloperPrivateEventRouter::OnErrorAdded(const ExtensionError* error) {
   // We don't want to handle errors thrown by extensions subscribed to these
   // events (currently only the Apps Developer Tool), because doing so risks
   // entering a loop.
-  if (extension_ids_.find(error->extension_id()) != extension_ids_.end())
+  if (extension_ids_.count(error->extension_id()))
     return;
 
   BroadcastItemStateChanged(
       profile_, developer::EVENT_TYPE_ERROR_ADDED, error->extension_id());
 }
 
+void DeveloperPrivateEventRouter::OnErrorsRemoved(
+    const std::set<std::string>& removed_ids) {
+  for (const std::string& id : removed_ids) {
+    if (!extension_ids_.count(id)) {
+      BroadcastItemStateChanged(
+          profile_, developer::EVENT_TYPE_ERRORS_REMOVED, id);
+    }
+  }
+}
+
 void DeveloperPrivateEventRouter::OnExtensionFrameRegistered(
     const std::string& extension_id,
     content::RenderFrameHost* render_frame_host) {