Have HTMLFrameOwnerElement / SubframeLoadingDisabler deal with references

Source/core/html/HTMLFrameOwnerElement.cpp

Index: Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/Source/core/html/HTMLFrameOwnerElement.cpp b/Source/core/html/HTMLFrameOwnerElement.cpp
index d0728672d0173dd7d072ecb87c7af1c327b65918..45e8831348333d6e53f57b51917a1f8f4578a019 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -50,14 +50,13 @@ RenderPart* HTMLFrameOwnerElement::renderPart() const
     return toRenderPart(renderer());
 }
 
-void HTMLFrameOwnerElement::setContentFrame(Frame* frame)
+void HTMLFrameOwnerElement::setContentFrame(Frame& frame)
 {
     // Make sure we will not end up with two frames referencing the same owner element.
     ASSERT(!m_contentFrame || m_contentFrame->ownerElement() != this);
-    ASSERT(frame);
     // Disconnected frames should not be allowed to load.
     ASSERT(inDocument());
-    m_contentFrame = frame;
+    m_contentFrame = &frame;
 
     for (ContainerNode* node = this; node; node = node->parentOrShadowHostNode())
         node->incrementConnectedSubframeCount();
@@ -136,7 +135,7 @@ bool HTMLFrameOwnerElement::loadOrRedirectSubframe(const KURL& url, const Atomic
         return false;
     }
 
-    if (!SubframeLoadingDisabler::canLoadFrame(this))
+    if (!SubframeLoadingDisabler::canLoadFrame(*this))
         return false;
 
     String referrer = SecurityPolicy::generateReferrerHeader(document().referrerPolicy(), url, parentFrame->loader().outgoingReferrer());