Change ContentsView::SetActivePage to use States rather than indexes.

ui/app_list/views/all_apps_tile_item_view.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 "ui/app_list/views/all_apps_tile_item_view.h"
 
 #include "ui/app_list/views/contents_view.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace app_list {
 
 AllAppsTileItemView::AllAppsTileItemView(ContentsView* contents_view,
                                          AppListItemList* item_list)
     : contents_view_(contents_view), folder_image_(item_list) {
   SetTitle(l10n_util::GetStringUTF16(IDS_APP_LIST_ALL_APPS));
   folder_image_.AddObserver(this);
 }
 
 AllAppsTileItemView::~AllAppsTileItemView() {
   folder_image_.RemoveObserver(this);
 }
 
 void AllAppsTileItemView::UpdateIcon() {
   folder_image_.UpdateIcon();
 }
 
 void AllAppsTileItemView::ButtonPressed(views::Button* sender,
                                         const ui::Event& event) {
-  contents_view_->SetActivePage(
-      contents_view_->GetPageIndexForState(AppListModel::STATE_APPS));
+  contents_view_->SetActivePage(AppListModel::STATE_APPS);
 }
 
 void AllAppsTileItemView::OnFolderImageUpdated() {
   SetIcon(folder_image_.icon());
 }
 
 }  // namespace app_list