Fix for single-process WebUI transition CHECK failure.

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/logging.h"
@@ skipping 1740 matching lines @@
           switches::kEnableBrowserSideNavigation)) {
     dest_web_ui =
         should_reuse_web_ui_ ? web_ui_.get() : speculative_web_ui_.get();
   } else {
     dest_web_ui = pending_web_ui();
   }
   if (dest_web_ui && !render_view_host->GetProcess()->IsForGuestsOnly()) {
     render_view_host->AllowBindings(dest_web_ui->GetBindings());
   } else {
     // Ensure that we don't create an unprivileged RenderView in a WebUI-enabled
-    // process unless it's swapped out.
-    if (render_view_host->is_active()) {
+    // process unless it's swapped out or we run in single-process mode.
+    if (render_view_host->is_active()
+        && !RenderProcessHost::run_renderer_in_process()) {
       CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
                 render_view_host->GetProcess()->GetID()));
     }
   }
 
   return delegate_->CreateRenderViewForRenderManager(
       render_view_host,
       opener_route_id,
       proxy_routing_id,
       frame_tree_node_->current_replication_state(),
@@ skipping 550 matching lines @@
     frame_tree->root()->render_manager()->
         CreateRenderFrame(instance, nullptr, opener_route_id,
                           CREATE_RF_FOR_MAIN_FRAME_NAVIGATION |
                           CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN,
                           &render_view_routing_id);
   }
   return render_view_routing_id;
 }
 
 }  // namespace content