Add a button to exit managed mode.

chrome/browser/managed_mode.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 "chrome/browser/managed_mode.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 23 matching lines @@
 
 // static
 bool ManagedMode::IsInManagedMode() {
   return GetInstance()->IsInManagedModeImpl();
 }
 
 bool ManagedMode::IsInManagedModeImpl() {
   // |g_browser_process| can be NULL during startup.
   if (!g_browser_process)
     return false;
+  // Local State can be NULL during unit tests.
+  if (!g_browser_process->local_state())
+    return false;
   return g_browser_process->local_state()->GetBoolean(prefs::kInManagedMode);
 }
 
 // static
 void ManagedMode::EnterManagedMode(Profile* profile,
                                    const EnterCallback& callback) {
   GetInstance()->EnterManagedModeImpl(profile, callback);
 }
 
 void ManagedMode::EnterManagedModeImpl(Profile* profile,
@@ skipping 142 matching lines @@
 void ManagedMode::SetInManagedMode(bool in_managed_mode) {
   g_browser_process->local_state()->SetBoolean(prefs::kInManagedMode,
                                                in_managed_mode);
   // This causes the avatar and the profile menu to get updated.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PROFILE_CACHED_INFO_CHANGED,
       content::NotificationService::AllBrowserContextsAndSources(),
       content::NotificationService::NoDetails());
 }