Convert UserPolicySigninService to use OAuth2TokenService

components/browser_context_keyed_service/browser_context_keyed_service_factory.h

Index: components/browser_context_keyed_service/browser_context_keyed_service_factory.h
diff --git a/components/browser_context_keyed_service/browser_context_keyed_service_factory.h b/components/browser_context_keyed_service/browser_context_keyed_service_factory.h
index 2775e4cc45b28e44510b75f983613d7c88952a29..8142d9cb161feb1cb792f88c53688b4b104e2279 100644
--- a/components/browser_context_keyed_service/browser_context_keyed_service_factory.h
+++ b/components/browser_context_keyed_service/browser_context_keyed_service_factory.h
@@ -39,6 +39,15 @@ class BROWSER_CONTEXT_KEYED_SERVICE_EXPORT BrowserContextKeyedServiceFactory
   void SetTestingFactory(content::BrowserContext* context,
                          FactoryFunction factory);
 
+  // Like SetTestingFactory(), but takes effect for all contexts. This is useful
+  // for injecting services that are created as part of context initialization.
+  // Callers should be sure to call ResetGlobalTestingFactory() at the end of
+  // their test to avoid polluting the singletons for future tests.
+  void SetGlobalTestingFactory(FactoryFunction factory);
+
+  // Clears a global testing factory that was previously set.
+  void ResetGlobalTestingFactory();
+
   // Associates |factory| with |context| and immediately returns the created
   // BrowserContextKeyedService. Since the factory will be used immediately,
   // it may not be NULL.
@@ -110,12 +119,17 @@ class BROWSER_CONTEXT_KEYED_SERVICE_EXPORT BrowserContextKeyedServiceFactory
   typedef std::map<content::BrowserContext*, FactoryFunction>
       BrowserContextOverriddenFunctions;
 
+  void CleanupExistingServices(content::BrowserContext* context);
+
   // The mapping between a BrowserContext and its service.
   std::map<content::BrowserContext*, BrowserContextKeyedService*> mapping_;
 
   // The mapping between a BrowserContext and its overridden FactoryFunction.
   std::map<content::BrowserContext*, FactoryFunction> factories_;
 
+  FactoryFunction global_factory_;
+  bool have_global_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserContextKeyedServiceFactory);
 };