Revert 179302

ui/app_list/views/signin_view.cc

-// Copyright 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 "ui/app_list/views/signin_view.h"
-
-#include "content/public/browser/web_contents.h"
-#include "ui/app_list/signin_delegate.h"
-#include "ui/views/controls/webview/webview.h"
-#include "ui/views/layout/fill_layout.h"
-
-namespace app_list {
-
-SigninView::SigninView(SigninDelegate* delegate)
-    : web_view_(new views::WebView(NULL)), delegate_(delegate) {
-  SetLayoutManager(new views::FillLayout());
-  AddChildView(web_view_);
-}
-
-SigninView::~SigninView() {
-  web_view_->SetWebContents(NULL);
-}
-
-void SigninView::BeginSignin() {
-  if (!delegate_)
-    return;
-
-  web_contents_.reset(delegate_->PrepareForSignin());
-  web_view_->SetWebContents(web_contents_.get());
-}
-
-}  // namespace app_list