[Extensions Toolbar] Add a finch config for the redesign

chrome/browser/extensions/location_bar_controller.cc

Index: chrome/browser/extensions/location_bar_controller.cc
diff --git a/chrome/browser/extensions/location_bar_controller.cc b/chrome/browser/extensions/location_bar_controller.cc
index f32d633697e39672cbea55f969f1fd45babb047f..89af53a53f7a6d39e2987b33b5e69d7cfe9995d6 100644
--- a/chrome/browser/extensions/location_bar_controller.cc
+++ b/chrome/browser/extensions/location_bar_controller.cc
@@ -30,8 +30,7 @@ LocationBarController::LocationBarController(
       should_show_page_actions_(
           !FeatureSwitch::extension_action_redesign()->IsEnabled()),
       extension_registry_observer_(this) {
-  if (should_show_page_actions_)
-    extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
+  extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
 }
 
 LocationBarController::~LocationBarController() {
@@ -93,7 +92,7 @@ std::vector<ExtensionAction*> LocationBarController::GetCurrentActions() {
 void LocationBarController::OnExtensionLoaded(
     content::BrowserContext* browser_context,
     const Extension* extension) {
-  if (action_manager_->GetPageAction(*extension)) {
+  if (should_show_page_actions_ && action_manager_->GetPageAction(*extension)) {
     ExtensionActionAPI::Get(browser_context)->
         NotifyPageActionsChanged(web_contents_);
   }
@@ -122,7 +121,7 @@ void LocationBarController::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
     UnloadedExtensionInfo::Reason reason) {
-  if (action_manager_->GetPageAction(*extension)) {
+  if (should_show_page_actions_ && action_manager_->GetPageAction(*extension)) {
     ExtensionActionAPI::Get(browser_context)->
         NotifyPageActionsChanged(web_contents_);
   }