Cleanup: give ChromeAppSorting a BrowserContext

extensions/browser/app_sorting.h

Index: extensions/browser/app_sorting.h
diff --git a/extensions/browser/app_sorting.h b/extensions/browser/app_sorting.h
index bc6378db30536d1643bbacafee4d06126655efde..3ab4c80c51d1f17ebc406ef7c04dea37e53a736f 100644
--- a/extensions/browser/app_sorting.h
+++ b/extensions/browser/app_sorting.h
@@ -11,8 +11,6 @@
 #include "extensions/common/extension.h"
 #include "sync/api/string_ordinal.h"
 
-class ExtensionSyncService;
-
 namespace extensions {
 
 class ExtensionScopedPrefs;
@@ -32,10 +30,6 @@ class AppSorting {
   // Remove it after the investigation is concluded.
   virtual void CheckExtensionScopedPrefs() const = 0;
 
-  // Sets up the ExtensionSyncService to inform of changes that require syncing.
-  virtual void SetExtensionSyncService(
-      ExtensionSyncService* extension_sync_service) = 0;
-
   // Properly initializes internal values that require |extension_ids|.
   // SetExtensionScopedPrefs must have been called prior to this.
   virtual void Initialize(const extensions::ExtensionIdList& extension_ids) = 0;