[Autofill] Fix outdated comment

The (?) tooltip was removed in
https://chromium-review.googlesource.com/c/chromium/src/+/1107778 but
the comment was not updated.

Change-Id: I2403df4e5672c26b306da628cc46c2e5faa8d63a
Reviewed-on: https://chromium-review.googlesource.com/1125207Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#572387}

chrome/browser/ui/views/autofill/card_unmask_prompt_views.cc

@@ -201,7 +201,7 @@ views::View* CardUnmaskPromptViews::CreateFootnoteView() {
   if (!controller_->CanStoreLocally())
     return nullptr;
 
-  // Local storage checkbox and (?) tooltip.
+  // Local storage checkbox.
   storage_row_ = new views::View();
   ChromeLayoutProvider* provider = ChromeLayoutProvider::Get();
   auto* storage_row_layout =