Remove unused method declaration - IsLikelyAutoNavigation.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 327 matching lines @@
   // preparation to add another.
   void PruneOldestEntryIfFull();
 
   // Removes all entries except the last committed entry.  If there is a new
   // pending navigation it is preserved. In contrast to
   // PruneAllButLastCommitted() this does not update the session history of the
   // RenderView.  Callers must ensure that |CanPruneAllButLastCommitted| returns
   // true before calling this.
   void PruneAllButLastCommittedInternal();
 
-  // Returns true if the navigation is likley to be automatic rather than
-  // user-initiated.
-  bool IsLikelyAutoNavigation(base::TimeTicks now);
-
   // Inserts up to |max_index| entries from |source| into this. This does NOT
   // adjust any of the members that reference entries_
   // (last_committed_entry_index_, pending_entry_index_ or
   // transient_entry_index_).
   void InsertEntriesFrom(const NavigationControllerImpl& source, int max_index);
 
   // Returns the navigation index that differs from the current entry by the
   // specified |offset|.  The index returned is not guaranteed to be valid.
   int GetIndexForOffset(int offset) const;
 
@@ skipping 87 matching lines @@
   TimeSmoother time_smoother_;
 
   std::unique_ptr<NavigationEntryScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_