Don't allow extensions to take screenshots of interstitial pages. Branched from
https://codereview.chromium.org/14885004/ which is trying to test it.

BUG=229504

Review URL: https://chromiumcodereview.appspot.com/14954004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198297 0039d316-1c4b-4281-b951-d872f2087c98
void TabsCaptureVisibleTabFunction::SendInternalError() {
  error_ = keys::kInternalVisibleTabCaptureError;
  SendResponse(false);
}

void TabsCaptureVisibleTabFunction::SendInternalError() {
  error_ = keys::kInternalVisibleTabCaptureError;
  SendResponse(false);
}
