Fix CHECK that's being fired inside NavigationControllerImpl::RendererDidNavigateToExistingPage.

content/browser/frame_host/navigation_controller_impl.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.
 
 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  *     (http://www.torchmobile.com/)
  *
@@ skipping 1201 matching lines @@
 
   // TODO(creis): Classify location.replace as NEW_PAGE instead of EXISTING_PAGE
   // in https://crbug.com/596707.
 
   NavigationEntryImpl* entry;
   if (params.intended_as_new_entry) {
     // This was intended as a new entry but the pending entry was lost in the
     // meanwhile and no new page was created. We are stuck at the last committed
     // entry.
     entry = GetLastCommittedEntry();
-    CHECK(!is_in_page);
-    entry->GetSSL() = handle->ssl_status();
+    // If this is an in-page navigation, then there's no SSLStatus in the
+    // NavigationHandle so don't overwrite the existing entry's SSLStatus.
+    if (!is_in_page)
+      entry->GetSSL() = handle->ssl_status();
   } else if (params.nav_entry_id) {
     // This is a browser-initiated navigation (back/forward/reload).
     entry = GetEntryWithUniqueID(params.nav_entry_id);
 
     if (is_in_page) {
       // There's no SSLStatus in the NavigationHandle for in-page navigations,
       // so normally we leave |entry|'s SSLStatus as is. However if this was a
       // restored in-page navigation entry, then it won't have an SSLStatus. So
       // we need to copy over the SSLStatus from the entry that navigated it.
       NavigationEntryImpl* last_entry = GetLastCommittedEntry();
@@ skipping 922 matching lines @@
     }
   }
 }
 
 void NavigationControllerImpl::SetGetTimestampCallbackForTest(
     const base::Callback<base::Time()>& get_timestamp_callback) {
   get_timestamp_callback_ = get_timestamp_callback;
 }
 
 }  // namespace content