Add a non-blocking "OneShotEvent" class

chrome/browser/extensions/test_extension_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_sync_data.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "sync/api/sync_error_factory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 88 matching lines @@
   return syncer::SyncDataList();
 }
 
 syncer::SyncError TestExtensionService::ProcessSyncChanges(
     const tracked_objects::Location& from_here,
     const syncer::SyncChangeList& change_list) {
   ADD_FAILURE();
   return syncer::SyncError();
 }
 
-bool TestExtensionService::is_ready() {
-  ADD_FAILURE();
-  return false;
-}
-
 base::SequencedTaskRunner* TestExtensionService::GetFileTaskRunner() {
   ADD_FAILURE();
   return NULL;
 }
 
 void TestExtensionService::AddExtension(const Extension* extension) {
   ADD_FAILURE();
 }
 
 void TestExtensionService::AddComponentExtension(const Extension* extension) {
   ADD_FAILURE();
 }
 
 void TestExtensionService::UnloadExtension(
     const std::string& extension_id,
     extension_misc::UnloadedExtensionReason reason) {
   ADD_FAILURE();
 }
 
 void TestExtensionService::SyncExtensionChangeIfNeeded(
     const Extension& extension) {
   ADD_FAILURE();
 }