[Sheriff] Revert "Revert "Revert 266297 "1. Handle the case of empty embedder_extension_id..."""

chrome/browser/guest_view/guest_view.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 CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
-#define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
-
-#include "chrome/browser/guest_view/guest_view_base.h"
-
-template <typename T>
-class GuestView : public GuestViewBase {
- public:
-  static T* From(int embedder_process_id, int guest_instance_id) {
-    GuestViewBase* guest =
-        GuestViewBase::From(embedder_process_id, guest_instance_id);
-    if (!guest)
-      return NULL;
-    return guest->As<T>();
-  }
-
-  static T* FromWebContents(content::WebContents* contents) {
-    GuestViewBase* guest = GuestViewBase::FromWebContents(contents);
-    return guest ? guest->As<T>() : NULL;
-  }
-
-  // GuestViewBase implementation.
-  virtual const std::string& GetViewType() const OVERRIDE { return type_; }
-
- protected:
-  GuestView(content::WebContents* guest_web_contents,
-            const std::string& embedder_extension_id)
-      : GuestViewBase(guest_web_contents, embedder_extension_id),
-        type_(T::Type) {}
-
- private:
-  std::string type_;
-
-  DISALLOW_COPY_AND_ASSIGN(GuestView);
-};
-
-#endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_