Temporarily CHECK that the swappedout:// URL isn't sent to the browser process.

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1693 matching lines @@
 }
 
 void RenderViewHostImpl::FilterURL(ChildProcessSecurityPolicyImpl* policy,
                                    const RenderProcessHost* process,
                                    bool empty_allowed,
                                    GURL* url) {
   if (empty_allowed && url->is_empty())
     return;
 
   // The browser process should never hear the swappedout:// URL from any
-  // of the renderer's messages.  Check for this in debug builds, but don't
-  // let it crash a release browser.
-  DCHECK(GURL(kSwappedOutURL) != *url);
+  // of the renderer's messages.  Temporarily CHECK on a canary build to see if
+  // it's still happening in the wild.
+  CHECK(GURL(kSwappedOutURL) != *url);
 
   if (!url->is_valid()) {
     // Have to use about:blank for the denied case, instead of an empty GURL.
     // This is because the browser treats navigation to an empty GURL as a
     // navigation to the home page. This is often a privileged page
     // (chrome://newtab/) which is exactly what we don't want.
     *url = GURL(chrome::kAboutBlankURL);
     return;
   }
 
@@ skipping 299 matching lines @@
   is_waiting_for_beforeunload_ack_ = false;
   is_waiting_for_unload_ack_ = false;
   has_timed_out_on_unload_ = false;
 }
 
 void RenderViewHostImpl::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }
 
 }  // namespace content