Skip user activation at ExternalPopupMenu::DidCancel()

Bug: 1079466
Change-Id: Ie3a333c5c7a6e16a85fe2734165961b84692b0d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442869Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812760}

third_party/blink/renderer/core/html/forms/external_popup_menu.cc

@@ -232,9 +232,6 @@ void ExternalPopupMenu::DidAcceptIndices(const Vector<int32_t>& indices) {
 }
 
 void ExternalPopupMenu::DidCancel() {
-  local_frame_->NotifyUserActivation(
-      mojom::blink::UserActivationNotificationType::kInteraction);
-
   if (owner_element_)
     owner_element_->PopupDidHide();
   Reset();