Remove unused code.

app/src/main/java/chat/rocket/android/authentication/ui/AuthenticationActivity.kt

@@ -5,7 +5,6 @@ import android.support.v4.app.Fragment
 import android.support.v7.app.AppCompatActivity
 import chat.rocket.android.R
 import chat.rocket.android.authentication.server.ui.ServerFragment
-import chat.rocket.android.helper.LayoutHelper
 import chat.rocket.android.util.addFragment
 import dagger.android.AndroidInjection
 import dagger.android.AndroidInjector
@@ -15,25 +14,18 @@ import javax.inject.Inject
 
 class AuthenticationActivity : AppCompatActivity(), HasSupportFragmentInjector {
     @Inject lateinit var fragmentDispatchingAndroidInjector: DispatchingAndroidInjector<Fragment>
-    private val layoutHelper = LayoutHelper()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_authentication)
 
         AndroidInjection.inject(this)
-        layoutHelper.install(this)
 
         addFragment("authenticationServerFragment", R.id.fragment_container) {
             ServerFragment.newInstance()
         }
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        layoutHelper.remove()
-    }
-
     override fun supportFragmentInjector(): AndroidInjector<Fragment> {
         return fragmentDispatchingAndroidInjector
     }