Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/custom_handlers/protocol_handler_registry_unittest.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/custom_handlers/protocol_handler_registry.h"
 
 #include <set>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
+#include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/custom_handlers/protocol_handler.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_renderer_host.h"
 #include "net/url_request/url_request.h"
@@ skipping 909 matching lines @@
 
 TEST_F(ProtocolHandlerRegistryTest, MAYBE_TestInstallDefaultHandler) {
   RecreateRegistry(false);
   registry()->AddPredefinedHandler(CreateProtocolHandler(
       "test", GURL("http://test.com/%s"), "Test"));
   registry()->InitProtocolSettings();
   std::vector<std::string> protocols;
   registry()->GetRegisteredProtocols(&protocols);
   ASSERT_EQ(static_cast<size_t>(1), protocols.size());
 }