Introduce ActiveScriptController; track active extension scripts

chrome/browser/extensions/api/extension_action/extension_action_api.cc

Index: chrome/browser/extensions/api/extension_action/extension_action_api.cc
diff --git a/chrome/browser/extensions/api/extension_action/extension_action_api.cc b/chrome/browser/extensions/api/extension_action/extension_action_api.cc
index 3b552b3cd30ea21b014c1c5073317db540926b07..70e6bbea3f4d5f1e79140b77b413dcfbc42b4714 100644
--- a/chrome/browser/extensions/api/extension_action/extension_action_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_action_api.cc
@@ -445,7 +445,7 @@ void ExtensionActionStorageManager::OnExtensionLoaded(
                    AsWeakPtr(),
                    extension->id()));
   }
-};
+}
 
 void ExtensionActionStorageManager::Observe(
     int type,
@@ -632,8 +632,7 @@ void ExtensionActionFunction::NotifyBrowserActionChange() {
 }
 
 void ExtensionActionFunction::NotifyLocationBarChange() {
-  TabHelper::FromWebContents(contents_)->
-      location_bar_controller()->NotifyChange();
+  LocationBarController::NotifyChange(contents_);
 }
 
 void ExtensionActionFunction::NotifySystemIndicatorChange() {
@@ -909,8 +908,7 @@ bool PageActionsFunction::SetPageActionEnabled(bool enable) {
   // Set visibility and broadcast notifications that the UI should be updated.
   page_action->SetIsVisible(tab_id, enable);
   page_action->SetTitle(tab_id, title);
-  extensions::TabHelper::FromWebContents(contents)->
-      location_bar_controller()->NotifyChange();
+  extensions::LocationBarController::NotifyChange(contents);
 
   return true;
 }