Implement upgrade-insecure-requests in browser for frame requests

content/browser/frame_host/mixed_content_navigation_throttle.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 #define CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 
 #include <set>
 
 #include "base/gtest_prod_util.h"
@@ skipping 12 matching lines @@
 using ThrottleCheckResult = NavigationThrottle::ThrottleCheckResult;
 
 // Responsible for browser-process-side mixed content security checks. It is
 // only enabled if PlzNavigate is and checks only for frame-level resource loads
 // (aka navigation loads). Sub-resources fetches are checked in the renderer
 // process by MixedContentChecker. Changes to this class might need to be
 // reflected on its renderer counterpart.
 //
 // 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(
       NavigationHandle* navigation_handle);
 
   MixedContentNavigationThrottle(NavigationHandle* navigation_handle);
   ~MixedContentNavigationThrottle() override;
 
   // NavigationThrottle overrides.
   ThrottleCheckResult WillStartRequest() override;
@@ skipping 42 matching lines @@
   // values are reported to the respective renderer process after each mixed
   // content check is finished.
   std::set<int> mixed_content_features_;
 
   DISALLOW_COPY_AND_ASSIGN(MixedContentNavigationThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_