Convert UserPolicySigninService to use OAuth2TokenService

components/browser_context_keyed_service/browser_context_dependency_manager.cc

 // Copyright (c) 2013 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 "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 
 #include <algorithm>
 #include <deque>
 #include <iterator>
 
@@ skipping 46 matching lines @@
   }
 
 #ifndef NDEBUG
   DumpBrowserContextDependencies(context);
 #endif
 
   for (size_t i = 0; i < construction_order.size(); i++) {
     BrowserContextKeyedBaseFactory* factory =
         static_cast<BrowserContextKeyedBaseFactory*>(construction_order[i]);
 
-    if (!context->IsOffTheRecord()) {
+    if (is_testing_context || !context->IsOffTheRecord()) {
       // We only register preferences on normal contexts because the incognito
-      // context shares the pref service with the normal one.
+      // context shares the pref service with the normal one. Always register
+      // for testing contexts, because they often are created standalone
+      // without an associated "normal" context.
       factory->RegisterUserPrefsOnBrowserContext(context);
     }
 
     if (is_testing_context && factory->ServiceIsNULLWhileTesting()) {
       factory->SetEmptyTestingFactory(context);
     } else if (factory->ServiceIsCreatedWithBrowserContext()) {
       // Create the service.
       factory->CreateServiceNow(context);
     }
   }
@@ skipping 70 matching lines @@
           kDumpBrowserContextDependencyGraphFlag)) {
     base::FilePath dot_file =
         context->GetPath().AppendASCII("browser-context-dependencies.dot");
     std::string contents = dependency_graph_.DumpAsGraphviz(
         "BrowserContext",
         base::Bind(&BrowserContextKeyedBaseFactoryGetNodeName));
     file_util::WriteFile(dot_file, contents.c_str(), contents.size());
   }
 }
 #endif  // NDEBUG