- Electron version: >=0.37
- Operating system: ubuntu linux x64

When server send header 'WWW-Authenticate: Negotiate' electron not send kerberos ticket. 
`app.allowNTLMCredentialsForAllDomains(true)`  is called.

On electron v0.36.x it work's fine.

atom/browser/atom_browser_context.h
class AtomCertVerifier;
class AtomNetworkDelegate;
class AtomPermissionManager;
class AtomURLRequestJobFactory;
class WebViewManager;
class AtomBrowserContext : public brightray::BrowserContext {
 public:
  AtomBrowserContext(const std::string& partition, bool in_memory);
  ~AtomBrowserContext() override;
  
  net::NetworkDelegate* CreateNetworkDelegate() override;
  std::string GetUserAgent() override;
  scoped_ptr<net::URLRequestJobFactory> CreateURLRequestJobFactory(
      content::ProtocolHandlerMap* handlers,
      content::URLRequestInterceptorScopedVector* interceptors) override;
  net::HttpCache::BackendFactory* CreateHttpCacheBackendFactory(
      const base::FilePath& base_path) override;
  scoped_ptr<net::CertVerifier> CreateCertVerifier() override;
  net::SSLConfigService* CreateSSLConfigService() override;
  bool AllowNTLMCredentialsForDomain(const GURL& auth_origin) override;
  
  content::DownloadManagerDelegate* GetDownloadManagerDelegate() override;
  content::BrowserPluginGuestManager* GetGuestManager() override;
  content::PermissionManager* GetPermissionManager() override;
  
  void RegisterPrefs(PrefRegistrySimple* pref_registry) override;
  void AllowNTLMCredentialsForAllDomains(bool should_allow);
  AtomCertVerifier* cert_verifier() const { return cert_verifier_; }