cros: Remove unused method

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc

 // Copyright (c) 2013 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/ui/webui/chromeos/login/user_image_screen_handler.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 71 matching lines @@
   ShowScreen(OobeScreen::SCREEN_USER_IMAGE_PICKER);
 
   // When shown, query camera presence.
   if (model_ && is_ready_)
     model_->OnScreenReady();
 }
 
 void UserImageScreenHandler::Hide() {
 }
 
-void UserImageScreenHandler::PrepareToShow() {
-}
-
 void UserImageScreenHandler::DeclareLocalizedValues(
     ::login::LocalizedValuesBuilder* builder) {
   builder->Add("userImageScreenTitle", IDS_USER_IMAGE_SCREEN_TITLE);
   builder->Add("userImageScreenDescription",
                IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TEXT);
   builder->Add("takePhoto", IDS_OPTIONS_CHANGE_PICTURE_TAKE_PHOTO);
   builder->Add("discardPhoto", IDS_OPTIONS_CHANGE_PICTURE_DISCARD_PHOTO);
   builder->Add("flipPhoto", IDS_OPTIONS_CHANGE_PICTURE_FLIP_PHOTO);
   builder->Add("profilePhoto", IDS_IMAGE_SCREEN_PROFILE_PHOTO);
   builder->Add("profilePhotoLoading",
@@ skipping 90 matching lines @@
   base::TimeDelta delta = base::Time::Now() - screen_show_time_;
   VLOG(1) << "Screen load time: " << delta.InSecondsF();
   UMA_HISTOGRAM_TIMES("UserImage.ScreenIsShownTime", delta);
 }
 
 void UserImageScreenHandler::HideCurtain() {
   CallJS("hideCurtain");
 }
 
 }  // namespace chromeos