Make iOS ConfirmInforBars close if delegate LinkClicked returns true.

The delegate's documentation mentions that returning true should close
the infobar.

Bug: 954339
Change-Id: Ibbe75f180f828afebd72c4c7953045da9249b7c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574443Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652524}

ios/chrome/browser/infobars/confirm_infobar_controller.mm

@@ -163,7 +163,10 @@ typedef NS_ENUM(NSInteger, ConfirmInfoBarUITags) {
     return;
 
   DCHECK(tag == ConfirmInfoBarUITags::TITLE_LINK);
-  self.infoBarDelegate->LinkClicked(WindowOpenDisposition::NEW_FOREGROUND_TAB);
+  if (self.infoBarDelegate->LinkClicked(
+          WindowOpenDisposition::NEW_FOREGROUND_TAB)) {
+    self.delegate->RemoveInfoBar();
+  }
 }
 
 @end