chrome.loadTimes() shouldn't be affected by in-document navigation.

chrome/renderer/prerender/prerender_helper.cc

 // Copyright (c) 2011 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/prerender/prerender_helper.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "chrome/common/render_messages.h"
 #include "content/public/renderer/navigation_state.h"
@@ skipping 114 matching lines @@
   // If this is the first provisional load since prerendering started, get its
   // request time.
   if (is_prerendering_ && prerender_start_time_.is_null()) {
     WebKit::WebDataSource* data_source = frame->provisionalDataSource();
     if (!data_source) {
       NOTREACHED();
       return;
     }
     NavigationState* navigation_state =
         NavigationState::FromDataSource(data_source);
-    prerender_start_time_ = navigation_state->request_time();
+    prerender_start_time_ = navigation_state->load_times()->request_time();
     // The first navigation for prerendering RenderViews can only be triggered
     // from PrerenderContents, so there should be a request_time.
     DCHECK(!prerender_start_time_.is_null());
   }
 }
 
 bool PrerenderHelper::OnMessageReceived(
     const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(PrerenderHelper, message)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetIsPrerendering, OnSetIsPrerendering)
@@ skipping 21 matching lines @@
 }
 
 void PrerenderHelper::UpdateVisibilityState() {
   if (render_view()->GetWebView()) {
     render_view()->GetWebView()->setVisibilityState(
         render_view()->GetVisibilityState(), false);
   }
 }
 
 }  // namespace prerender