Code: bool isNodeAriaVisible(Node* node) {
  if (!node)
    return false;

   if (!node->isElementNode())
     return false;
 
  return equalIgnoringCase(toElement(node)->getAttribute(aria_hiddenAttr),
                           "false");
 }

Vulnerability Type: Exec Code 
CWE ID: CWE-254
Summary: Google Chrome before 44.0.2403.89 does not ensure that the auto-open list omits all dangerous file types, which makes it easier for remote attackers to execute arbitrary code by providing a crafted file and leveraging a user's previous *Always open files of this type* choice, related to download_commands.cc and download_prefs.cc.
Commit Message: Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}