signin: pull basic SigninManager functionality into new SigninManagerBase class.

chrome/browser/signin/signin_manager_factory.cc

Index: chrome/browser/signin/signin_manager_factory.cc
diff --git a/chrome/browser/signin/signin_manager_factory.cc b/chrome/browser/signin/signin_manager_factory.cc
index 67e33c07dc9b7ec18e4c4ee86afd54ac215918b8..7a897c21674ffe37fb5d7d4d71f2b6f7e724abd6 100644
--- a/chrome/browser/signin/signin_manager_factory.cc
+++ b/chrome/browser/signin/signin_manager_factory.cc
@@ -34,6 +34,20 @@ SigninManager* SigninManagerFactory::GetForProfileIfExists(Profile* profile) {
 }
 
 // static
+SigninManagerBase* SigninManagerFactory::GetBaseForProfileIfExists(
+    Profile* profile) {
+  return static_cast<SigninManagerBase*>(
+      GetInstance()->GetServiceForProfile(profile, false));
+}
+
+// static
+SigninManagerBase* SigninManagerFactory::GetBaseForProfile(
+    Profile* profile) {
+  return static_cast<SigninManagerBase*>(
+      GetInstance()->GetServiceForProfile(profile, true));
+}
+
+// static
 SigninManagerFactory* SigninManagerFactory::GetInstance() {
   return Singleton<SigninManagerFactory>::get();
 }