notification balloons: Remove views and cocoa implementations of BalloonCollection.

chrome/browser/ui/views/notifications/balloon_view_host.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 "chrome/browser/ui/views/notifications/balloon_view_host.h"
-
-#include "chrome/browser/notifications/balloon.h"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/render_widget_host_view.h"
-#include "content/public/browser/web_contents.h"
-#include "ui/views/widget/widget.h"
-
-class BalloonViewHostView : public views::NativeViewHost {
- public:
-  explicit BalloonViewHostView(BalloonViewHost* host)
-      : host_(host),
-        initialized_(false) {
-  }
-
-  virtual void ViewHierarchyChanged(
-      const ViewHierarchyChangedDetails& details) OVERRIDE {
-    NativeViewHost::ViewHierarchyChanged(details);
-    if (details.is_add && GetWidget() && !initialized_) {
-      initialized_ = true;
-      host_->Init(GetWidget()->GetNativeView());
-    }
-  }
-
- private:
-  // The host owns this object.
-  BalloonViewHost* host_;
-
-  bool initialized_;
-};
-
-BalloonViewHost::BalloonViewHost(Balloon* balloon)
-    : BalloonHost(balloon) {
-  native_host_ = new BalloonViewHostView(this);
-}
-
-BalloonViewHost::~BalloonViewHost() {
-  Shutdown();
-}
-
-void BalloonViewHost::Init(gfx::NativeView parent_native_view) {
-  parent_native_view_ = parent_native_view;
-  BalloonHost::Init();
-
-  content::RenderWidgetHostView* render_widget_host_view =
-      web_contents_->GetRenderViewHost()->GetView();
-
-  native_host_->Attach(render_widget_host_view->GetNativeView());
-}