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 7a4cee52ca40e0f40456850e6db628f76db1f822..09b26ef7d6f5c0e3651d9911f0cc751e93ee9e32 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -4673,6 +4673,10 @@ 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()) {