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

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index 0c218bcf5a772cdf7ff1766a733cac77091ea9c6..03a988189bcfd302f5f3a83228627767d21945bb 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -1415,18 +1415,4 @@
     return toLocalFrame(parentFrame)->document()->insecureRequestsPolicy();
 }
 
-SecurityContext::InsecureNavigationsSet* FrameLoader::insecureNavigationsToUpgrade() const
-{
-    Frame* parentFrame = m_frame->tree().parent();
-    if (!parentFrame)
-        return nullptr;
-
-    // FIXME: We need a way to propagate insecure requests policy flags to
-    // out-of-process frames. For now, we'll always use default behavior.
-    if (!parentFrame->isLocalFrame())
-        return nullptr;
-
-    return toLocalFrame(parentFrame)->document()->insecureNavigationsToUpgrade();
-}
-
 } // namespace blink