Apply ExtensionNavigationThrottle filesystem/blob checks to all frames.

BUG=836858

Change-Id: I34333a72501129fd40b5a9aa6378c9f35f1e7fc2
Reviewed-on: https://chromium-review.googlesource.com/1028511
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Nick Carter <nick@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553867}
ui::AXNodeData GetFocusedAccessibilityNodeInfo(WebContents* web_contents) {
  WebContentsImpl* web_contents_impl =
      static_cast<WebContentsImpl*>(web_contents);
  BrowserAccessibilityManager* manager =
      web_contents_impl->GetRootBrowserAccessibilityManager();
  if (!manager)
    return ui::AXNodeData();
  BrowserAccessibility* focused_node = manager->GetFocus();
  return focused_node->GetData();
}

ui::AXNodeData GetFocusedAccessibilityNodeInfo(WebContents* web_contents) {
  WebContentsImpl* web_contents_impl =
      static_cast<WebContentsImpl*>(web_contents);
  BrowserAccessibilityManager* manager =
      web_contents_impl->GetRootBrowserAccessibilityManager();
  if (!manager)
    return ui::AXNodeData();
  BrowserAccessibility* focused_node = manager->GetFocus();
  return focused_node->GetData();
}
