Allow MimeHandlerViewGuest be embedded inside OOPIFs

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>
 
@@ skipping 182 matching lines @@
   // This value is only valid after attachment or first navigation.
   int proxy_routing_id() const { return guest_proxy_routing_id_; }
 
   // Destroy this guest.
   void Destroy();
 
   // Saves the attach state of the custom element hosting this GuestView.
   void SetAttachParams(const base::DictionaryValue& params);
   void SetOpener(GuestViewBase* opener);
 
+  // BrowserPluginGuestDelegate implementation.
+  content::RenderFrameHost* GetEmbedderFrame() override;
+
  protected:
   explicit GuestViewBase(content::WebContents* owner_web_contents);
 
   ~GuestViewBase() override;
 
   // BrowserPluginGuestDelegate implementation.
   void SetContextMenuPosition(const gfx::Point& position) override;
 
   // WebContentsDelegate implementation.
   void HandleKeyboardEvent(
@@ skipping 266 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_