PlzNavigate: add PDF viewer bypass hack to avoid crash.

content/browser/loader/navigation_resource_handler.cc

 // Copyright 2014 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/loader/navigation_resource_handler.h"
 
 #include "base/logging.h"
 #include "content/browser/devtools/devtools_netlog_observer.h"
 #include "content/browser/loader/navigation_url_loader_impl_core.h"
 #include "content/browser/loader/resource_request_info_impl.h"
@@ skipping 53 matching lines @@
 }
 
 bool NavigationResourceHandler::OnResponseStarted(ResourceResponse* response,
                                                   bool* defer) {
   DCHECK(core_);
 
   ResourceRequestInfoImpl* info = GetRequestInfo();
 
   // If the MimeTypeResourceHandler intercepted this request and converted it
   // into a download, it will still call OnResponseStarted and immediately
-  // cancel. Ignore the call; OnReadCompleted will happen shortly.
+  // cancel. Ignore the call; OnResponseCompleted will happen shortly.
   //
   // TODO(davidben): Move the dispatch out of MimeTypeResourceHandler. Perhaps
   // all the way to the UI thread. Downloads, user certificates, etc., should be
   // dispatched at the navigation layer.
   if (info->IsDownload() || info->is_stream())
     return true;
 
   StreamContext* stream_context =
       GetStreamContextForResourceContext(info->GetContext());
   writer_.InitializeStream(stream_context->registry(),
@@ skipping 53 matching lines @@
   NOTREACHED();
 }
 
 void NavigationResourceHandler::DetachFromCore() {
   DCHECK(core_);
   core_->set_resource_handler(nullptr);
   core_ = nullptr;
 }
 
 }  // namespace content