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"
+#include "content/public/renderer/document_state.h"
 #include "content/public/renderer/render_view.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 
-using content::NavigationState;
+using content::DocumentState;
 
 // Helper macro for histograms.
 #define RECORD_PLT(tag, perceived_page_load_time) { \
     UMA_HISTOGRAM_CUSTOM_TIMES( \
         base::FieldTrial::MakeName(std::string("Prerender.") + tag, \
                                    "Prefetch"), \
         perceived_page_load_time, \
         base::TimeDelta::FromMilliseconds(10), \
         base::TimeDelta::FromSeconds(60), \
         100); \
@@ skipping 97 matching lines @@
 
 void PrerenderHelper::DidStartProvisionalLoad(WebKit::WebFrame* frame) {
   // 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();
+    DocumentState* document_state =
+        DocumentState::FromDataSource(data_source);
+    prerender_start_time_ = document_state->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