cros: Remove unused method

chrome/browser/chromeos/login/screens/controller_pairing_screen.cc

 // Copyright 2014 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/chromeos/login/screens/controller_pairing_screen.h"
 
 #include "base/command_line.h"
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
@@ skipping 35 matching lines @@
 }
 
 bool ControllerPairingScreen::ExpectStageIs(Stage stage) const {
   DCHECK(stage == current_stage_);
   if (current_stage_ != stage)
     LOG(ERROR) << "Incorrect stage. Expected: " << stage
                << ", current stage: " << current_stage_;
   return stage == current_stage_;
 }
 
-void ControllerPairingScreen::PrepareToShow() {
-}
-
 void ControllerPairingScreen::Show() {
   if (actor_)
     actor_->Show();
   shark_controller_->StartPairing();
 }
 
 void ControllerPairingScreen::Hide() {
   if (actor_)
     actor_->Hide();
 }
@@ skipping 146 matching lines @@
        ++key) {
     if (*key == kContextKeySelectedDevice) {
       context_.SetBoolean(kContextKeyControlsDisabled,
                           context_.GetString(*key).empty());
       CommitContextChanges();
     }
   }
 }
 
 }  // namespace chromeos