components: Cleanup class/struct fwd declarations

components/guest_view/browser/guest_view_base.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_GUEST_VIEW_BROWSER_GUEST_VIEW_BASE_H_
 #define COMPONENTS_GUEST_VIEW_BROWSER_GUEST_VIEW_BASE_H_
 
 #include <memory>
 #include <queue>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "components/zoom/zoom_observer.h"
 #include "content/public/browser/browser_plugin_guest_delegate.h"
 #include "content/public/browser/guest_host.h"
 #include "content/public/browser/render_process_host_observer.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 
-struct RendererContentSettingRules;
-
 namespace guest_view {
 
 class GuestViewEvent;
 
 // A struct of parameters for SetSize(). The parameters are all declared as
 // scoped pointers since they are all optional. Null pointers indicate that the
 // parameter has not been provided, and the last used value should be used. Note
 // that when |enable_auto_size| is true, providing |normal_size| is not
 // meaningful. This is because the normal size of the guestview is overridden
 // whenever autosizing occurs.
@@ skipping 454 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<GuestViewBase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewBase);
 };
 
 }  // namespace guest_view
 
 #endif  // COMPONENTS_GUEST_VIEW_BROWSER_GUEST_VIEW_BASE_H_