Don't grant WebUI bindings during non-WebUI subframe navigations.

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 <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 1983 matching lines @@
     int proxy_routing_id) {
   // Ensure the renderer process is initialized before creating the
   // RenderView.
   if (!render_view_host->GetProcess()->Init())
     return false;
 
   // We may have initialized this RenderViewHost for another RenderFrameHost.
   if (render_view_host->IsRenderViewLive())
     return true;
 
-  // If the ongoing 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 |render_view_host| is not for a proxy and the navigation is to a WebUI,
+  // and if the RenderView is not in a guest process, tell |render_view_host|
+  // about any bindings it will need enabled.
+  // TODO(carlosk): Move WebUI to RenderFrameHost in https://crbug.com/508850.
   WebUIImpl* dest_web_ui = nullptr;
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBrowserSideNavigation)) {
-    dest_web_ui =
-        should_reuse_web_ui_ ? web_ui_.get() : speculative_web_ui_.get();
-  } else {
-    dest_web_ui = pending_web_ui();
+  DCHECK_EQ(render_view_host->is_active(),
+            proxy_routing_id == MSG_ROUTING_NONE);
+  if (proxy_routing_id == MSG_ROUTING_NONE) {
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            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()) {
       CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
                 render_view_host->GetProcess()->GetID()));
     }
@@ skipping 614 matching lines @@
 int RenderFrameHostManager::GetOpenerRoutingID(SiteInstance* instance) {
   if (!frame_tree_node_->opener())
     return MSG_ROUTING_NONE;
 
   return frame_tree_node_->opener()
       ->render_manager()
       ->GetRoutingIdForSiteInstance(instance);
 }
 
 }  // namespace content