[ios] Removed checkLinkPresenceUnderGesture API as unused.

ios/web/web_state/ui/crw_web_controller.mm

 // 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.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 1280 matching lines @@
   // Mark the destruction sequence has started, in case someone else holds a
   // strong reference and tries to continue using the tab.
   _isBeingDestroyed = YES;
 
   // Remove the web view now. Otherwise, delegate callbacks occur.
   [self removeWebViewAllowingCachedReconstruction:NO];
 
   _webStateImpl = nullptr;
 }
 
-- (void)checkLinkPresenceUnderGesture:(UIGestureRecognizer*)gestureRecognizer
-                    completionHandler:(void (^)(BOOL))completionHandler {
-  CGPoint webViewPoint = [gestureRecognizer locationInView:_webView];
-  base::WeakNSObject<CRWWebController> weakSelf(self);
-  [self fetchDOMElementAtPoint:webViewPoint
-             completionHandler:^(NSDictionary* element) {
-               BOOL hasLink = [element[@"href"] length];
-               completionHandler(hasLink);
-             }];
-}
-
 - (void)setDOMElementForLastTouch:(NSDictionary*)element {
   _DOMElementForLastTouch.reset([element copy]);
 }
 
 - (void)showContextMenu:(UIGestureRecognizer*)gestureRecognizer {
   // We don't want ongoing notification that the long press is held.
   if ([gestureRecognizer state] != UIGestureRecognizerStateBegan)
     return;
 
   if (![_DOMElementForLastTouch count])
@@ skipping 4300 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end