Elide the permission bubble title from the head of the string.

Long URLs can be used to spoof other origins in the permission bubble
title. This CL customises the title to be elided from the head, which
ensures that the maximal amount of the URL host is displayed in the case
where the URL is too long and causes the string to overflow.

Implementing the ellision means that the title cannot be multiline
(where elision is not well supported). Note that in English, the
window title is a string "$ORIGIN wants to", so the non-origin
component will not be elided. In other languages, the non-origin
component may appear fully or partly before the origin (e.g. in
Filipino, "Gusto ng $ORIGIN na"), so it may be elided there if the
URL is sufficiently long. This is not optimal, but the URLs that are
sufficiently long to trigger the elision are probably malicious, and
displaying the most relevant component of the URL is most important
for security purposes.

BUG=774438

Change-Id: I75c2364b10bf69bf337c7f4970481bf1809f6aae
Reviewed-on: https://chromium-review.googlesource.com/768312
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Lucas Garron <lgarron@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516921}
bool PermissionsBubbleDialogDelegateView::Cancel() {
  if (owner_) {
    owner_->TogglePersist(!persist_checkbox_ || persist_checkbox_->checked());
    owner_->Deny();
  }
  return true;
}

bool PermissionsBubbleDialogDelegateView::Cancel() {
  if (owner_) {
    owner_->TogglePersist(!persist_checkbox_ || persist_checkbox_->checked());
    owner_->Deny();
  }
  return true;
}
