Fixed suggesting adding more users into multi-profile session when we don't have more

ash/shell/shell_delegate_impl.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 "ash/shell/shell_delegate_impl.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/default_accessibility_delegate.h"
 #include "ash/default_user_wallpaper_delegate.h"
 #include "ash/gpu_support_stub.h"
@@ skipping 74 matching lines @@
   }
   virtual content::BrowserContext* GetBrowserContextForWindow(
       aura::Window* window) OVERRIDE {
     return Shell::GetInstance()->delegate()->GetActiveBrowserContext();
   }
   virtual int GetMaximumNumberOfLoggedInUsers() const OVERRIDE { return 3; }
   virtual int NumberOfLoggedInUsers() const OVERRIDE {
     // ash_shell has 2 users.
     return 2;
   }
+  virtual int GetNumberOfAdmittedForMultiProfileUsers() const OVERRIDE {
+    return GetMaximumNumberOfLoggedInUsers() - NumberOfLoggedInUsers();
+  }
   virtual bool IsActiveUserSessionStarted() const OVERRIDE { return true; }
   virtual bool CanLockScreen() const OVERRIDE { return true; }
   virtual bool IsScreenLocked() const OVERRIDE { return screen_locked_; }
   virtual bool ShouldLockScreenBeforeSuspending() const OVERRIDE {
     return false;
   }
   virtual void LockScreen() OVERRIDE {
     shell::CreateLockScreen();
     screen_locked_ = true;
     Shell::GetInstance()->UpdateShelfVisibility();
@@ skipping 151 matching lines @@
   // Real GPU support depends on src/content, so just use a stub.
   return new GPUSupportStub;
 }
 
 base::string16 ShellDelegateImpl::GetProductName() const {
   return base::string16();
 }
 
 }  // namespace shell
 }  // namespace ash