Revert of Add a Restore() method to ValueStore and make StorageAPI use it

chrome/browser/extensions/test_extension_system.cc

Index: chrome/browser/extensions/test_extension_system.cc
diff --git a/chrome/browser/extensions/test_extension_system.cc b/chrome/browser/extensions/test_extension_system.cc
index 67e522a8a8f41e7c2055e8c4c5c263f786ebebb3..416ca664f742d9a27643eb17cc8009d7d01eaffd 100644
--- a/chrome/browser/extensions/test_extension_system.cc
+++ b/chrome/browser/extensions/test_extension_system.cc
@@ -152,11 +152,9 @@
   return NULL;
 }
 
-void TestExtensionSystem::SetEventRouter(scoped_ptr<EventRouter> event_router) {
-  event_router_.reset(event_router.release());
+EventRouter* TestExtensionSystem::event_router() {
+  return NULL;
 }
-
-EventRouter* TestExtensionSystem::event_router() { return event_router_.get(); }
 
 ExtensionWarningService* TestExtensionSystem::warning_service() {
   return NULL;