Add chromium-side support for history.{push,replace}State.

chrome/browser/tab_contents/navigation_controller.cc

 // Copyright (c) 2009 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/browser/tab_contents/navigation_controller.h"
 
 #include "app/resource_bundle.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
@@ skipping 777 matching lines @@
       params.page_id);
 
   // Reference fragment navigation. We're guaranteed to have the last_committed
   // entry and it will be the same page as the new navigation (minus the
   // reference fragments, of course).
   NavigationEntry* new_entry = new NavigationEntry(*existing_entry);
   new_entry->set_page_id(params.page_id);
   if (new_entry->update_virtual_url_with_url())
     UpdateVirtualURLToURL(new_entry, params.url);
   new_entry->set_url(params.url);
-  *did_replace_entry = IsRedirect(params) &&
-                       IsLikelyAutoNavigation(base::TimeTicks::Now());
-  InsertOrReplaceEntry(new_entry, *did_replace_entry);
+
+  // This replaces the existing entry since the page ID didn't change.
+  *did_replace_entry = true;
+  InsertOrReplaceEntry(new_entry, true);
 }
 
 void NavigationController::RendererDidNavigateNewSubframe(
     const ViewHostMsg_FrameNavigate_Params& params) {
   if (PageTransition::StripQualifier(params.transition) ==
       PageTransition::AUTO_SUBFRAME) {
     // This is not user-initiated. Ignore.
     return;
   }
 
@@ skipping 285 matching lines @@
       return i;
   }
   return -1;
 }
 
 NavigationEntry* NavigationController::GetTransientEntry() const {
   if (transient_entry_index_ == -1)
     return NULL;
   return entries_[transient_entry_index_].get();
 }