Force-setting default browser through policy should not crash.

chrome/browser/browser_process_impl.h

 // Copyright (c) 2011 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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 152 matching lines @@
   void CreateTabCloseableStateWatcher();
   void CreatePrintPreviewTabController();
   void CreateBackgroundPrintingManager();
   void CreateSafeBrowsingService();
   void CreateSafeBrowsingDetectionService();
   void CreateStatusTray();
   void CreateBackgroundModeManager();
 
   void ApplyDisabledSchemesPolicy();
   void ApplyAllowCrossOriginAuthPromptPolicy();
+  void ApplyDefaultBrowserPolicy();
 
 #if defined(IPC_MESSAGE_LOG_ENABLED)
   void SetIPCLoggingEnabledForChildProcesses(bool enabled);
 #endif
 
   bool created_resource_dispatcher_host_;
   scoped_ptr<ResourceDispatcherHost> resource_dispatcher_host_;
 
   bool created_metrics_service_;
   scoped_ptr<MetricsService> metrics_service_;
@@ skipping 138 matching lines @@
 #if !defined(OS_CHROMEOS)
   scoped_ptr<ComponentUpdateService> component_updater_;
 
   scoped_refptr<CRLSetFetcher> crl_set_fetcher_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_