Avoid stale navigation requests without excessive page id knowledge in the renderer process.

content/browser/web_contents/web_contents_impl_unittest.cc

 // Copyright (c) 2012 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 "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/frame_host/cross_site_transferring_request.h"
 #include "content/browser/frame_host/interstitial_page_impl.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/media/audio_stream_monitor.h"
@@ skipping 2264 matching lines @@
   interstitial->TestDidNavigate(1, url2);
   EXPECT_TRUE(interstitial->is_showing());
   EXPECT_EQ(2, controller().GetEntryCount());
 
   // Create another NavigationController.
   GURL url3("http://foo2");
   scoped_ptr<TestWebContents> other_contents(
       static_cast<TestWebContents*>(CreateTestWebContents()));
   NavigationControllerImpl& other_controller = other_contents->GetController();
   other_contents->NavigateAndCommit(url3);
-  other_contents->ExpectSetHistoryLengthAndPrune(
-      NavigationEntryImpl::FromNavigationEntry(
-          other_controller.GetEntryAtIndex(0))->site_instance(), 1,
-      other_controller.GetEntryAtIndex(0)->GetPageID());
+  other_contents->ExpectSetHistoryOffsetAndLength(1, 2);
   other_controller.CopyStateFromAndPrune(&controller(), false);
 
   // The merged controller should only have two entries: url1 and url2.
   ASSERT_EQ(2, other_controller.GetEntryCount());
   EXPECT_EQ(1, other_controller.GetCurrentEntryIndex());
   EXPECT_EQ(url1, other_controller.GetEntryAtIndex(0)->GetURL());
   EXPECT_EQ(url3, other_controller.GetEntryAtIndex(1)->GetURL());
 
   // And the merged controller shouldn't be showing an interstitial.
   EXPECT_FALSE(other_contents->ShowingInterstitialPage());
@@ skipping 489 matching lines @@
 
   // Destroy the remote player. No power save blockers should remain.
   rfh->OnMessageReceived(
       FrameHostMsg_MediaPausedNotification(0, kPlayerRemoteId));
   EXPECT_FALSE(contents()->has_video_power_save_blocker_for_testing());
   EXPECT_FALSE(contents()->has_audio_power_save_blocker_for_testing());
 }
 #endif
 
 }  // namespace content