Remove profile-keyed factory boilerplates.

chrome/browser/extensions/api/history/history_api.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/api/history/history_api.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
+#include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ skipping 184 matching lines @@
       this, kOnVisitRemoved);
 }
 
 HistoryAPI::~HistoryAPI() {
 }
 
 void HistoryAPI::Shutdown() {
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
+static base::LazyInstance<ProfileKeyedAPIFactory<HistoryAPI> >
+g_factory = LAZY_INSTANCE_INITIALIZER;
+
+// static
+ProfileKeyedAPIFactory<HistoryAPI>* HistoryAPI::GetFactoryInstance() {
+  return &g_factory.Get();
+}
+
 void HistoryAPI::OnListenerAdded(const EventListenerInfo& details) {
   history_event_router_.reset(new HistoryEventRouter(profile_));
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
 void HistoryFunction::Run() {
   if (!RunImpl()) {
     SendResponse(false);
   }
 }
@@ skipping 240 matching lines @@
       &task_tracker_);
 
   return true;
 }
 
 void HistoryDeleteAllFunction::DeleteComplete() {
   SendAsyncResponse();
 }
 
 }  // namespace extensions