Remove dependency of infobars component on the embedder

components/infobars/core/confirm_infobar_delegate_factory.h

+// Copyright 2014 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 COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_FACTORY_H_
+#define COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace infobars {
+class InfoBar;
+}
+
+class ConfirmInfoBarDelegate;
+
+// ConfirmInfoBarDelegateFactory is an abstract singleton allowing the embedder
+// to inject an implementation of |ConfirmInfoBarDelegate::CreateInfoBar()|.
+class ConfirmInfoBarDelegateFactory {
+ public:
+  // Sets the global instance returned by |GetInstance|.  The embedder owns the
+  // |instance| and is responsible for calling SetInstance(nullptr) before
+  // destroying it.  Must be called before any method in infobars component.
+  static void SetInstance(ConfirmInfoBarDelegateFactory* instance);
+
+ protected:
+  ConfirmInfoBarDelegateFactory();
+  virtual ~ConfirmInfoBarDelegateFactory();
+
+  // Returns the global ConfirmInfoBarDelegateFactory instance.
+  static ConfirmInfoBarDelegateFactory* GetInstance();
+
+ private:
+  // ConfirmInfoBarDelegate is the sole client of this factory.  To keep the
+  // interface sealed, all methods are private and the class is marked as a
+  // friend.
+  friend class ConfirmInfoBarDelegate;
+
+  // Returns a confirm infobar that owns |delegate|
+  virtual scoped_ptr<infobars::InfoBar> CreateInfoBar(
+      scoped_ptr<ConfirmInfoBarDelegate> delegate) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfirmInfoBarDelegateFactory);
+};
+
+#endif  // COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_FACTORY_H_