app_list: Initialize more views in the initializer list.

ui/app_list/page_switcher.cc

 // Copyright (c) 2012 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/page_switcher.h"
 
 #include <algorithm>
 
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/app_list/pagination_model.h"
@@ skipping 105 matching lines @@
 PageSwitcherButton* GetButtonByIndex(views::View* buttons, int index) {
   return static_cast<PageSwitcherButton*>(buttons->child_at(index));
 }
 
 }  // namespace
 
 namespace app_list {
 
 PageSwitcher::PageSwitcher(PaginationModel* model)
     : model_(model),
-      buttons_(NULL) {
-  buttons_ = new views::View;
+      buttons_(new views::View) {
   buttons_->SetLayoutManager(new views::BoxLayout(
       views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing));
   AddChildView(buttons_);
 
   TotalPagesChanged();
   SelectedPageChanged(-1, model->selected_page());
   model_->AddObserver(this);
 }
 
 PageSwitcher::~PageSwitcher() {
@@ skipping 76 matching lines @@
     remaining = -remaining;
     progress = -progress;
   }
 
   GetButtonByIndex(buttons_, current_page)->SetSelectedRange(remaining);
   if (model_->is_valid_page(target_page))
     GetButtonByIndex(buttons_, target_page)->SetSelectedRange(progress);
 }
 
 }  // namespace app_list