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

chrome/browser/tab_contents/navigation_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <string>
@@ skipping 71 matching lines @@
     GURL previous_url;
 
     // True when this load was non-user initated. This corresponds to a
     // a NavigationGestureAuto call from WebKit (see webview_delegate.h).
     // We also count reloads and meta-refreshes as "auto" to account for the
     // fact that WebKit doesn't always set the user gesture properly in these
     // cases (see bug 1051891).
     bool is_auto;
 
     // True if the committed entry has replaced the exisiting one.
-    // A non-user initiated redierct causes such replacement.
+    // A non-user initiated redirect causes such replacement.
     // This is somewhat similiar to is_auto, but not exactly the same.
     bool did_replace_entry;
 
     // True if the navigation was in-page. This means that the active entry's
     // URL and the |previous_url| are the same except for reference fragments.
     bool is_in_page;
 
     // True when the main frame was navigated. False means the navigation was a
     // sub-frame.
     bool is_main_frame;
@@ skipping 451 matching lines @@
   // when testing.
   static bool check_for_repost_;
 
   // The maximum number of entries that a navigation controller can store.
   static size_t max_entry_count_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationController);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_