Plumb document's strict mixed content checking for RemoteFrames

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index 96d6c1f6d836ff6dc84fe017d5e220c0403fd812..5efbadd656156feb29939b5261794ba3b2b418c4 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -1184,6 +1184,17 @@ void RenderFrameHostManager::OnDidUpdateName(const std::string& name) {
   }
 }
 
+void RenderFrameHostManager::OnEnforceStrictMixedContentChecking(
+    bool should_enforce) {
+  if (!SiteIsolationPolicy::AreCrossProcessFramesPossible())
+    return;
+
+  for (const auto& pair : *proxy_hosts_) {
+    pair.second->Send(new FrameMsg_EnforceStrictMixedContentChecking(
+        pair.second->GetRoutingID(), should_enforce));
+  }
+}
+
 void RenderFrameHostManager::OnDidUpdateOrigin(const url::Origin& origin) {
   if (!SiteIsolationPolicy::IsSwappedOutStateForbidden())
     return;