[IOSTabRefactoring] Remove goToItem from tab

Not used.

Bug: 898382
Change-Id: I796eac237414917a12944a2ce67b3963f035dfb0
Reviewed-on: https://chromium-review.googlesource.com/c/1297463Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602422}

ios/chrome/browser/tabs/tab.h

@@ -133,9 +133,6 @@ extern NSString* const kProxyPassthroughHeaderValue;
 // be populated. Can return null.
 - (web::NavigationManager*)navigationManager;
 
-// Navigate forwards or backwards to |item|.
-- (void)goToItem:(const web::NavigationItem*)item;
-
 // Navigates forwards or backwards.
 // TODO(crbug.com/661664): These are passthroughs to the Tab's WebState's
 // NavigationManager. Convert all callers and remove these methods.

ios/chrome/browser/tabs/tab.mm

@@ -331,13 +331,6 @@ NSString* const kTabUrlKey = @"url";
   return self.webState ? self.webState->GetNavigationManager() : nullptr;
 }
 
-- (void)goToItem:(const web::NavigationItem*)item {
-  DCHECK(item);
-  int index = self.navigationManager->GetIndexOfItem(item);
-  DCHECK_NE(index, -1);
-  self.navigationManager->GoToIndex(index);
-}
-
 - (void)goBack {
   if (self.navigationManager) {
     DCHECK(self.navigationManager->CanGoBack());