Remove usage of RenderViewHost which aren't needed anymore.

content/browser/frame_host/navigator_impl.cc

 // 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.
 
 #include "content/browser/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 246 matching lines @@
     bool has_browser_initiated_pending_entry = pending_entry &&
         !pending_entry->is_renderer_initiated();
     if (!has_browser_initiated_pending_entry && !is_error_page) {
       NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
           controller_->CreateNavigationEntry(validated_url,
                                              content::Referrer(),
                                              ui::PAGE_TRANSITION_LINK,
                                              true /* is_renderer_initiated */,
                                              std::string(),
                                              controller_->GetBrowserContext()));
-      entry->set_site_instance(
-          static_cast<SiteInstanceImpl*>(
-              render_frame_host->render_view_host()->GetSiteInstance()));
+      entry->set_site_instance(render_frame_host->GetSiteInstance());
       // TODO(creis): If there's a pending entry already, find a safe way to
       // update it instead of replacing it and copying over things like this.
       if (pending_entry) {
         entry->set_transferred_global_request_id(
             pending_entry->transferred_global_request_id());
         entry->set_should_replace_entry(pending_entry->should_replace_entry());
         entry->SetRedirectChain(pending_entry->GetRedirectChain());
       }
       controller_->SetPendingEntry(entry);
       if (delegate_)
@@ skipping 280 matching lines @@
   if (use_site_per_process) {
     FrameTreeNode* frame = render_frame_host->frame_tree_node();
     frame->render_manager()->DidNavigateFrame(
         render_frame_host, params.gesture == NavigationGestureUser);
   }
 
   // Update the site of the SiteInstance if it doesn't have one yet, unless
   // assigning a site is not necessary for this URL.  In that case, the
   // SiteInstance can still be considered unused until a navigation to a real
   // page.
-  SiteInstanceImpl* site_instance =
-      static_cast<SiteInstanceImpl*>(render_frame_host->GetSiteInstance());
+  SiteInstanceImpl* site_instance = render_frame_host->GetSiteInstance();
   if (!site_instance->HasSite() &&
       ShouldAssignSiteForURL(params.url)) {
     site_instance->SetSite(params.url);
   }
 
   // Need to update MIME type here because it's referred to in
   // UpdateNavigationCommands() called by RendererDidNavigate() to
   // determine whether or not to enable the encoding menu.
   // It's updated only for the main frame. For a subframe,
   // RenderView::UpdateURL does not set params.contents_mime_type.
@@ skipping 399 matching lines @@
         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_commit);
     UMA_HISTOGRAM_TIMES(
         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_network);
   }
   navigation_data_.reset();
 }
 
 }  // namespace content