Don't ensure, in single-process mode, that WebUI render views are the only ones in the process, as …

content/browser/frame_host/render_frame_host_manager.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/render_frame_host_manager.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1000 matching lines @@
   // If the pending navigation is to a WebUI and the RenderView is not in a
   // guest process, tell the RenderViewHost about any bindings it will need
   // enabled.
   if (pending_web_ui() && !render_view_host->GetProcess()->IsGuest()) {
     render_view_host->AllowBindings(pending_web_ui()->GetBindings());
   } else {
     // Ensure that we don't create an unprivileged RenderView in a WebUI-enabled
     // process unless it's swapped out.
     RenderViewHostImpl* rvh_impl =
         static_cast<RenderViewHostImpl*>(render_view_host);
-    if (!rvh_impl->IsSwappedOut()) {
+    // In single-process mode, we are forced to create all render views in
+    // the same single process.
+    bool single_process =
+        RenderProcessHost::run_renderer_in_process();
+    if (!rvh_impl->IsSwappedOut() && !single_process) {
       CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
                 render_view_host->GetProcess()->GetID()));
     }
   }
 
   return delegate_->CreateRenderViewForRenderManager(
       render_view_host, opener_route_id, proxy_routing_id, for_main_frame);
 }
 
 void RenderFrameHostManager::CommitPending() {
@@ skipping 448 matching lines @@
     SiteInstance* instance) const {
   RenderFrameProxyHostMap::const_iterator iter =
       proxy_hosts_.find(instance->GetId());
   if (iter != proxy_hosts_.end())
     return iter->second;
 
   return NULL;
 }
 
 }  // namespace content