notification balloons: Remove views and cocoa implementations of BalloonCollection.

chrome/browser/ui/views/notifications/balloon_view_host.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_HOST_H_
-#define CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_HOST_H_
-
-#include "chrome/browser/notifications/balloon_host.h"
-#include "ui/views/controls/native/native_view_host.h"
-
-// BalloonViewHost class is a delegate to the renderer host for the HTML
-// notification.  When initialized it creates a new RenderViewHost and loads
-// the contents of the toast into it.  It also handles links within the toast,
-// loading them into a new tab.
-class BalloonViewHost : public BalloonHost {
- public:
-  explicit BalloonViewHost(Balloon* balloon);
-
-  virtual ~BalloonViewHost();
-
-  void SetPreferredSize(const gfx::Size& size) {
-    native_host_->SetPreferredSize(size);
-  }
-
-  // Accessors.
-  views::View* view() {
-    return native_host_;
-  }
-
-  gfx::NativeView native_view() const {
-    return native_host_->native_view();
-  }
-
-  // Initialize the view, parented to |parent|, and show it.
-  void Init(gfx::NativeView parent);
-
- private:
-  // The views-specific host view. Pointer owned by the views hierarchy.
-  views::NativeViewHost* native_host_;
-
-  // The handle to the parent view.
-  gfx::NativeView parent_native_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(BalloonViewHost);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_HOST_H_