Avoid having every frame of a multipart response create a

chrome/renderer/render_view.cc

 // Copyright (c) 2010 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 "chrome/renderer/render_view.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1154 matching lines @@
   }
 
   // Set the URL to be displayed in the browser UI to the user.
   if (ds->hasUnreachableURL()) {
     params.url = ds->unreachableURL();
   } else {
     params.url = request.url();
   }
 
   GetRedirectChain(ds, &params.redirects);
-  params.should_update_history = !ds->hasUnreachableURL();
+  params.should_update_history = !ds->hasUnreachableURL() &&
+      !response.isMultipartPayload();
 
   params.searchable_form_url = navigation_state->searchable_form_url();
   params.searchable_form_encoding =
       navigation_state->searchable_form_encoding();
 
   const PasswordForm* password_form_data =
       navigation_state->password_form_data();
   if (password_form_data)
     params.password_form = *password_form_data;
 
@@ skipping 3382 matching lines @@
 void RenderView::GPUPluginBuffersSwapped(gfx::PluginWindowHandle window) {
   Send(new ViewHostMsg_GPUPluginBuffersSwapped(routing_id(), window));
 }
 #endif
 
 WebKit::WebGeolocationServiceInterface* RenderView::getGeolocationService() {
   if (!geolocation_dispatcher_.get())
     geolocation_dispatcher_.reset(new GeolocationDispatcher(this));
   return geolocation_dispatcher_.get();
 }