Set IsInitialNavigation to false after commit, not document load.

content/public/browser/navigation_controller.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 347 matching lines @@
   // Returns true if a reload happens when activated (SetActive(true) is
   // invoked). This is true for session/tab restore and cloned tabs.
   virtual bool NeedsReload() const = 0;
 
   // Cancels a repost that brought up a warning.
   virtual void CancelPendingReload() = 0;
   // Continues a repost that brought up a warning.
   virtual void ContinuePendingReload() = 0;
 
   // Returns true if we are navigating to the URL the tab is opened with.
-  // Returns false after initial navigation has loaded in frame.
-  virtual bool IsInitialNavigation() = 0;
+  // Returns false after the initial navigation has committed.
+  virtual bool IsInitialNavigation() const = 0;
 
   // Broadcasts the NOTIFY_NAV_ENTRY_CHANGED notification for the given entry
   // (which must be at the given index). This will keep things in sync like
   // the saved session.
   virtual void NotifyEntryChanged(const NavigationEntry* entry, int index) = 0;
 
   // Copies the navigation state from the given controller to this one. This
   // one should be empty (just created).
   virtual void CopyStateFrom(const NavigationController& source) = 0;
 
@@ skipping 12 matching lines @@
   virtual void PruneAllButActive() = 0;
 
   // Clears all screenshots associated with navigation entries in this
   // controller. Useful to reduce memory consumption in low-memory situations.
   virtual void ClearAllScreenshots() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_