Extension syncing: Introduce a NeedsSync pref

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 01efc6156303f30522673a96d3e670f7da4e6cee..c70e9eeed193bbd519763450ba05c8c669352aff 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -405,11 +405,6 @@ class ExtensionService
 
   Profile* profile() { return profile_; }
 
-  void set_extension_sync_service(
-      ExtensionSyncService* extension_sync_service) {
-    extension_sync_service_ = extension_sync_service;
-  }
-
   // Note that this may return NULL if autoupdate is not turned on.
   extensions::ExtensionUpdater* updater() { return updater_.get(); }
 
@@ -619,9 +614,6 @@ class ExtensionService
   // Blacklist for the owning profile.
   extensions::Blacklist* blacklist_;
 
-  // The ExtensionSyncService that is used by this ExtensionService.
-  ExtensionSyncService* extension_sync_service_;
-
   // Sets of enabled/disabled/terminated/blacklisted extensions. Not owned.
   extensions::ExtensionRegistry* registry_;