Extract minimal RenderViewHost interface for embedders, leaving

content/browser/download/mhtml_generation_manager.cc

Index: content/browser/download/mhtml_generation_manager.cc
diff --git a/content/browser/download/mhtml_generation_manager.cc b/content/browser/download/mhtml_generation_manager.cc
index 8e0ab7e9fb47de6e4ba73afc0ae189a035369fc3..890803a4ff3b789985d172f254ac566e3614aded 100644
--- a/content/browser/download/mhtml_generation_manager.cc
+++ b/content/browser/download/mhtml_generation_manager.cc
@@ -42,7 +42,7 @@ void MHTMLGenerationManager::GenerateMHTML(WebContents* web_contents,
   Job job;
   job.file_path = file;
   job.process_id = web_contents->GetRenderProcessHost()->GetID();
-  job.routing_id = web_contents->GetRenderViewHost()->routing_id();
+  job.routing_id = web_contents->GetRenderViewHost()->GetRoutingID();
   job.callback = callback;
   id_to_job_[job_id] = job;
 
@@ -96,14 +96,15 @@ void MHTMLGenerationManager::FileCreated(int job_id,
   job.browser_file = browser_file;
   job.renderer_file = renderer_file;
 
-  RenderViewHost* rvh = RenderViewHost::FromID(job.process_id, job.routing_id);
+  RenderViewHostImpl* rvh = RenderViewHostImpl::FromID(
+      job.process_id, job.routing_id);
   if (!rvh) {
     // The tab went away.
     JobFinished(job_id, -1);
     return;
   }
 
-  rvh->Send(new ViewMsg_SavePageAsMHTML(rvh->routing_id(), job_id,
+  rvh->Send(new ViewMsg_SavePageAsMHTML(rvh->GetRoutingID(), job_id,
                                         renderer_file));
 }