[Mac] Organize all infobar files into chrome/browser/ui/cocoa/infobars/....

chrome/browser/ui/cocoa/infobar.h

-// Copyright (c) 2009 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_COCOA_INFOBAR_H_
-#define CHROME_BROWSER_UI_COCOA_INFOBAR_H_
-#pragma once
-
-#include "base/logging.h"  // for DCHECK
-
-@class InfoBarController;
-
-// A C++ wrapper around an Objective-C InfoBarController.  This class
-// exists solely to be the return value for InfoBarDelegate::CreateInfoBar(),
-// as defined in chrome/browser/tab_contents/infobar_delegate.h.  This
-// class would be analogous to the various bridge classes we already
-// have, but since there is no pre-defined InfoBar interface, it is
-// easier to simply throw away this object and deal with the
-// controller directly rather than pass messages through a bridge.
-//
-// Callers should delete the returned InfoBar immediately after
-// calling CreateInfoBar(), as the returned InfoBar* object is not
-// pointed to by anyone.  Expected usage:
-//
-// scoped_ptr<InfoBar> infobar(delegate->CreateInfoBar());
-// InfoBarController* controller = infobar->controller();
-// // Do something with the controller, and save a pointer so it can be
-// // deleted later.  |infobar| will be deleted automatically.
-
-class InfoBar {
- public:
-  InfoBar(InfoBarController* controller) {
-    DCHECK(controller);
-    controller_ = controller;
-  }
-
-  InfoBarController* controller() {
-    return controller_;
-  }
-
- private:
-  // Pointer to the infobar controller.  Is never null.
-  InfoBarController* controller_;  // weak
-
-  DISALLOW_COPY_AND_ASSIGN(InfoBar);
-};
-
-#endif  // CHROME_BROWSER_UI_COCOA_INFOBAR_H_