Upgrade insecure requests: Pipe navigational hosts down into nested documents.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 5892f71f3f9fd158e7a27b4e8186ef0154279088..a77f4f0297866d5f491b885b768a11b8634fb159 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -4680,6 +4680,10 @@ void Document::initSecurityContext(const DocumentInit& initializer)
     if (initializer.shouldEnforceStrictMixedContentChecking())
         enforceStrictMixedContentChecking();
     setInsecureRequestsPolicy(initializer.insecureRequestsPolicy());
+    if (initializer.insecureNavigationsToUpgrade()) {
+        for (auto toUpgrade : *initializer.insecureNavigationsToUpgrade())
+            addInsecureNavigationUpgrade(toUpgrade);
+    }
     setSecurityOrigin(isSandboxed(SandboxOrigin) ? SecurityOrigin::createUnique() : SecurityOrigin::create(m_url));
 
     if (importsController()) {