Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/ui/media_stream_infobar_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_MEDIA_STREAM_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_UI_MEDIA_STREAM_INFOBAR_DELEGATE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/api/infobars/confirm_infobar_delegate.h"
 #include "chrome/browser/media/media_stream_devices_controller.h"
 
 
 // This class configures an infobar shown when a page requests access to a
 // user's microphone and/or video camera.  The user is shown a message asking
 // which audio and/or video devices he wishes to use with the current page, and
 // buttons to give access to the selected devices to the page, or to deny access
 // to them.
 class MediaStreamInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
-  // MediaStreamInfoBarDelegate takes the ownership of the |controller|.
-  MediaStreamInfoBarDelegate(
-      InfoBarService* infobar_service,
-      MediaStreamDevicesController* controller);
+  virtual ~MediaStreamInfoBarDelegate();
 
-  virtual ~MediaStreamInfoBarDelegate();
+  // Handles a permission request (in |request|) for |web_contents|.  If this
+  // involves prompting the user, creates a media stream delegate, then checks
+  // for an existing infobar for |web_contents| and replaces it if found, or
+  // just adds the new infobar otherwise.  Returns whether an infobar was
+  // created.
+  static bool Create(content::WebContents* web_contents,
+                     const content::MediaStreamRequest& request,
+                     const content::MediaResponseCallback& callback);
 
   // ConfirmInfoBarDelegate:
   virtual void InfoBarDismissed() OVERRIDE;
   virtual gfx::Image* GetIcon() const OVERRIDE;
   virtual Type GetInfoBarType() const OVERRIDE;
   virtual MediaStreamInfoBarDelegate* AsMediaStreamInfoBarDelegate() OVERRIDE;
   virtual string16 GetMessageText() const OVERRIDE;
   virtual string16 GetButtonLabel(InfoBarButton button) const OVERRIDE;
   virtual bool Accept() OVERRIDE;
   virtual bool Cancel() OVERRIDE;
   virtual string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
 
  private:
+  // MediaStreamInfoBarDelegate takes the ownership of the |controller|.
+  MediaStreamInfoBarDelegate(
+      InfoBarService* infobar_service,
+      MediaStreamDevicesController* controller);
+
   scoped_ptr<MediaStreamDevicesController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_MEDIA_STREAM_INFOBAR_DELEGATE_H_