Don't leave aborted URLs in the omnibox unless we're on a new tab.

content/browser/frame_host/navigation_controller_impl.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 76 matching lines @@
   virtual void NotifyEntryChanged(const NavigationEntry* entry,
                                  int index) OVERRIDE;
   virtual void CopyStateFrom(
       const NavigationController& source) OVERRIDE;
   virtual void CopyStateFromAndPrune(NavigationController* source,
                                      bool replace_entry) OVERRIDE;
   virtual bool CanPruneAllButLastCommitted() OVERRIDE;
   virtual void PruneAllButLastCommitted() OVERRIDE;
   virtual void ClearAllScreenshots() OVERRIDE;
 
+  // Whether this is the initial navigation in an unmodified new tab.  In this
+  // case, we know there is no content displayed in the page.
+  bool IsUnmodifiedBlankTab() const;
+
   // The session storage namespace that all child RenderViews belonging to
   // |instance| should use.
   SessionStorageNamespace* GetSessionStorageNamespace(
       SiteInstance* instance);
 
   // Returns the index of the specified entry, or -1 if entry is not contained
   // in this NavigationController.
   int GetIndexOfEntry(const NavigationEntryImpl* entry) const;
 
   // Return the index of the entry with the corresponding instance and page_id,
@@ skipping 306 matching lines @@
   TimeSmoother time_smoother_;
 
   scoped_ptr<NavigationEntryScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_