[ios] Remove IDC_BACK and IDC_FORWARD

ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm

 // Copyright 2014 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/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.h"
 
 #include "base/logging.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 107 matching lines @@
            withImageEnum:NTPToolbarButtonNameForward
          forInitialState:UIControlStateDisabled
         hasDisabledImage:YES
            synchronously:NO];
 
     UILongPressGestureRecognizer* backLongPress =
         [[UILongPressGestureRecognizer alloc]
             initWithTarget:self
                     action:@selector(handleLongPress:)];
     [_backButton addGestureRecognizer:backLongPress];
+    [_backButton addTarget:self.dispatcher
+                    action:@selector(goBack)
+          forControlEvents:UIControlEventTouchUpInside];
+
     UILongPressGestureRecognizer* forwardLongPress =
         [[UILongPressGestureRecognizer alloc]
             initWithTarget:self
                     action:@selector(handleLongPress:)];
     [_forwardButton addGestureRecognizer:forwardLongPress];
-    [_backButton setTag:IDC_BACK];
-    [_forwardButton setTag:IDC_FORWARD];
+    [_forwardButton addTarget:self.dispatcher
+                       action:@selector(goForward)
+             forControlEvents:UIControlEventTouchUpInside];
 
     [_omniboxFocuser addTarget:self
                         action:@selector(focusOmnibox:)
               forControlEvents:UIControlEventTouchUpInside];
 
     SetA11yLabelAndUiAutomationName(_backButton, IDS_ACCNAME_BACK, @"Back");
     SetA11yLabelAndUiAutomationName(_forwardButton, IDS_ACCNAME_FORWARD,
                                     @"Forward");
   }
   return self;
@@ skipping 81 matching lines @@
 
 - (void)focusOmnibox:(id)sender {
   [self.dispatcher focusFakebox];
 }
 
 - (IBAction)stackButtonTouchDown:(id)sender {
   [self.dispatcher prepareToEnterTabSwitcher:self];
 }
 
 @end