Clean up source_site_instance usage in Navigator::RequestOpenURL.

content/browser/frame_host/navigator_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 
 #include <memory>
 
 #include "base/containers/scoped_ptr_hash_map.h"
@@ skipping 50 matching lines @@
                               const FrameNavigationEntry& frame_entry,
                               ReloadType reload_type,
                               bool is_same_document_history_load) override;
   bool NavigateNewChildFrame(RenderFrameHostImpl* render_frame_host,
                              const GURL& default_url) override;
   void RequestOpenURL(RenderFrameHostImpl* render_frame_host,
                       const GURL& url,
                       bool uses_post,
                       const scoped_refptr<ResourceRequestBodyImpl>& body,
                       const std::string& extra_headers,
-                      SiteInstance* source_site_instance,
                       const Referrer& referrer,
                       WindowOpenDisposition disposition,
                       bool should_replace_current_entry,
                       bool user_gesture) override;
   void RequestTransferURL(RenderFrameHostImpl* render_frame_host,
                           const GURL& url,
                           SiteInstance* source_site_instance,
                           const std::vector<GURL>& redirect_chain,
                           const Referrer& referrer,
                           ui::PageTransition page_transition,
@@ skipping 77 matching lines @@
   NavigatorDelegate* delegate_;
 
   std::unique_ptr<NavigatorImpl::NavigationMetricsData> navigation_data_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_