[ios] Removed -[CRWSessionController goDelta:].

ios/web/navigation/crw_session_controller.h

 // Copyright 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 IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_
 #define IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_
 
 #import <Foundation/Foundation.h>
 #include <vector>
 
@@ skipping 91 matching lines @@
 
 - (void)discardNonCommittedEntries;
 
 // Returns YES if there is a pending entry.
 - (BOOL)hasPendingEntry;
 
 // Inserts history state from the given CRWSessionController to the front of
 // this controller.
 - (void)insertStateFromSessionController:(CRWSessionController*)otherController;
 
-// Returns YES if there are entries to go with given delta.
-- (BOOL)canGoDelta:(int)delta;
 // Sets |currentNavigationIndex_| to the |index| if it's in the entries bounds.
 - (void)goToEntryAtIndex:(NSInteger)index;
 
 // Removes the entry at |index| after discarding any noncomitted entries.
 // |index| must not be the index of the last committed entry, or a noncomitted
 // entry.
 - (void)removeEntryAtIndex:(NSInteger)index;
 
 // Returns an array containing all of the non-redirected CRWSessionEntry objects
 // whose index in |entries_| is less than |currentNavigationIndex_|.
@@ skipping 20 matching lines @@
 - (void)useDesktopUserAgentForNextPendingEntry;
 
 // Returns the navigation index that differs from the current entry (or pending
 // entry if it exists) by the specified |delta|, skipping redirect navigation
 // items. The index returned is not guaranteed to be valid.
 - (NSInteger)indexOfEntryForDelta:(int)delta;
 
 @end
 
 #endif  // IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_