[session_manager] Move user session initialization code out of ExistingUserController

chrome/browser/chromeos/login/user_flow.cc

Index: chrome/browser/chromeos/login/user_flow.cc
diff --git a/chrome/browser/chromeos/login/user_flow.cc b/chrome/browser/chromeos/login/user_flow.cc
index fcfc9ca9e07090d924c98b6477005462dc17e3b7..c845d3ed64d1d1325ec4f321f3f990bacaf71fad 100644
--- a/chrome/browser/chromeos/login/user_flow.cc
+++ b/chrome/browser/chromeos/login/user_flow.cc
@@ -24,6 +24,9 @@ UserFlow::~UserFlow() {}
 
 DefaultUserFlow::~DefaultUserFlow() {}
 
+void DefaultUserFlow::AppendAdditionalCommandLineSwitches() {
+}
+
 bool DefaultUserFlow::CanLockScreen() {
   return true;
 }
@@ -64,10 +67,17 @@ ExtendedUserFlow::ExtendedUserFlow(const std::string& user_id)
 ExtendedUserFlow::~ExtendedUserFlow() {
 }
 
+void ExtendedUserFlow::AppendAdditionalCommandLineSwitches() {
+}
+
 bool ExtendedUserFlow::ShouldShowSettings() {
   return true;
 }
 
+void ExtendedUserFlow::HandleOAuthTokenStatusChange(
+    user_manager::User::OAuthTokenStatus status) {
+}
+
 void ExtendedUserFlow::UnregisterFlowSoon() {
   std::string id_copy(user_id());
   base::MessageLoop::current()->PostTask(FROM_HERE,