[ios] Remove IDC_BACK and IDC_FORWARD

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

Index: ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm b/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
index deeb6f8fdac369aea0ded206daabc5f7918233c5..ff276324a79783154e4d8f32eb97b0d109cb6871 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
@@ -125,13 +125,18 @@ enum {
             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:)