Extract minimal RenderViewHost interface for embedders, leaving

content/browser/worker_host/worker_process_host.cc

Index: content/browser/worker_host/worker_process_host.cc
diff --git a/content/browser/worker_host/worker_process_host.cc b/content/browser/worker_host/worker_process_host.cc
index da2e586d1c69c3854d9e2fc7de1984f5a9559043..bcf1e3db1395cd2daea8808cef0a16389bdc2d46 100644
--- a/content/browser/worker_host/worker_process_host.cc
+++ b/content/browser/worker_host/worker_process_host.cc
@@ -86,10 +86,10 @@ class URLRequestContextSelector
 
 // Notifies RenderViewHost that one or more worker objects crashed.
 void WorkerCrashCallback(int render_process_unique_id, int render_view_id) {
-  RenderViewHost* host =
-      RenderViewHost::FromID(render_process_unique_id, render_view_id);
+  RenderViewHostImpl* host =
+      RenderViewHostImpl::FromID(render_process_unique_id, render_view_id);
   if (host)
-    host->delegate()->WorkerCrashed();
+    host->GetDelegate()->WorkerCrashed();
 }
 
 WorkerProcessHost::WorkerProcessHost(content::ResourceContext* resource_context)