Implement upgrade-insecure-requests in browser for frame requests

content/browser/frame_host/mixed_content_navigation_throttle.h

Index: content/browser/frame_host/mixed_content_navigation_throttle.h
diff --git a/content/browser/frame_host/mixed_content_navigation_throttle.h b/content/browser/frame_host/mixed_content_navigation_throttle.h
index 2313a7d41b0adc59a85c56a111e4d931741ab167..c7ca00f761e08f0d04eb02b5e95e4af28deb75bd 100644
--- a/content/browser/frame_host/mixed_content_navigation_throttle.h
+++ b/content/browser/frame_host/mixed_content_navigation_throttle.h
@@ -30,10 +30,6 @@ using ThrottleCheckResult = NavigationThrottle::ThrottleCheckResult;
 //
 // Current mixed content W3C draft that drives this implementation:
 // https://w3c.github.io/webappsec-mixed-content/
-//
-// TODO(carlosk): For HSTS to work properly in PlzNavigate when these browser
-// side mixed content checks happen it needs to be ported to the browser as a
-// navigation throttle implementation. See https://crbug.com/692157.
 class MixedContentNavigationThrottle : public NavigationThrottle {
  public:
   static std::unique_ptr<NavigationThrottle> CreateThrottleForNavigation(