Clean up the PermissionInfoBarDelegate hierarchy.

chrome/browser/permissions/single_permission_infobar_delegate.h

+// Copyright 2016 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_PERMISSIONS_SINGLE_PERMISSION_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_PERMISSIONS_SINGLE_PERMISSION_INFOBAR_DELEGATE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "chrome/browser/permissions/permission_infobar_delegate.h"
+#include "chrome/browser/permissions/permission_util.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+#include "content/public/browser/permission_type.h"
+
+class Profile;
+
+// Base class for single permission infobars. Implements the default behavior so
+// that the accept/deny buttons grant/deny the relevant permission.

[raymes, 2016/08/17 03:20:43]

nit: fill 80 chars or new paragraph

[dominickn, 2016/08/17 03:29:38]

Done.

+// A basic implementor only needs to implement the methods that provide an icon
+// and a message text to the infobar.
+class SinglePermissionInfoBarDelegate : public PermissionInfoBarDelegate {
+
+ public:
+  ~SinglePermissionInfoBarDelegate() override;
+  ContentSettingsType GetContentSettingType(int index) const override;
+  bool ShouldShowPersistenceToggle() const override;
+
+  // ConfirmInfoBarDelegate:
+  base::string16 GetMessageText() const override;

[raymes, 2016/08/17 03:36:40]

I think this can be private? It's public in the base class but I don't think it
needs to be public here? 

+
+ protected:
+  SinglePermissionInfoBarDelegate(const GURL& requesting_origin,
+                                  content::PermissionType permission_type,
+                                  ContentSettingsType content_settings_type,
+                                  bool user_gesture,
+                                  Profile* profile,
+                                  const PermissionSetCallback& callback);
+
+  virtual int GetMessageResourceId() const = 0;

[raymes, 2016/08/17 03:36:40]

I think this can be private?

+
+ private:
+  void SetPermission(bool update_content_setting, PermissionAction decision);
+
+  // ConfirmInfoBarDelegate:
+  base::string16 GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+  bool Cancel() override;
+  void InfoBarDismissed() override;
+
+  content::PermissionType permission_type_;
+  ContentSettingsType content_settings_type_;
+  Profile* const profile_;
+  const PermissionSetCallback callback_;
+  bool action_taken_;
+  bool user_gesture_;
+
+  DISALLOW_COPY_AND_ASSIGN(SinglePermissionInfoBarDelegate);
+};
+
+#endif  // CHROME_BROWSER_PERMISSIONS_SINGLE_PERMISSION_INFOBAR_DELEGATE_H_