[Web Intents] Refactor picker to use WebIntentPickerModel.

chrome/browser/ui/intents/web_intent_picker_factory_impl.cc

-// Copyright (c) 2011 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/intents/web_intent_picker_factory_impl.h"
-
-#include "base/logging.h"
-#include "chrome/browser/ui/intents/web_intent_picker.h"
-
-WebIntentPickerFactoryImpl::WebIntentPickerFactoryImpl()
-    : picker_(NULL) {
-}
-
-WebIntentPickerFactoryImpl::~WebIntentPickerFactoryImpl() {
-  Close();
-}
-
-WebIntentPicker* WebIntentPickerFactoryImpl::Create(
-    Browser* browser,
-    TabContentsWrapper* wrapper,
-    WebIntentPickerDelegate* delegate) {
-  // Only allow one picker per factory.
-  DCHECK(picker_ == NULL);
-
-  picker_ = WebIntentPicker::Create(browser, wrapper, delegate);
-  return picker_;
-}
-
-void WebIntentPickerFactoryImpl::ClosePicker(WebIntentPicker* picker) {
-  DCHECK(picker == picker_);
-  Close();
-}
-
-void WebIntentPickerFactoryImpl::Close() {
-  if (picker_) {
-    picker_->Close();
-    picker_ = NULL;
-  }
-}