Make ExtensionService use ExtensionSet.

chrome/browser/extensions/test_extension_service.cc

 // Copyright (c) 2011 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 "testing/gtest/include/gtest/gtest.h"
 
 TestExtensionService::~TestExtensionService() {}
 
-const ExtensionList* TestExtensionService::extensions() const {
+const ExtensionSet* TestExtensionService::extensions() const {
   ADD_FAILURE();
   return NULL;
 }
 
 PendingExtensionManager* TestExtensionService::pending_extension_manager() {
   ADD_FAILURE();
   return NULL;
 }
 
 bool TestExtensionService::UpdateExtension(
@@ skipping 74 matching lines @@
 
 void TestExtensionService::AddExtension(const Extension* extension) {
   ADD_FAILURE();
 }
 
 void TestExtensionService::UnloadExtension(
     const std::string& extension_id,
     extension_misc::UnloadedExtensionReason reason) {
   ADD_FAILURE();
 }