Cherry-pick 275113@main (53a8668). https://bugs.webkit.org/show_bug.c…

…gi?id=269829

    Remove the owner element null check in WebFrame::parentFrame()
    https://bugs.webkit.org/show_bug.cgi?id=269829
    rdar://123343035

    Reviewed by Alex Christensen.

    I tried to fix a null pointer crash in 274274@main with Site Isolation enabled but didn’t remove this
    null check. If the parent frame is being hosted in another process the owner element will always be null.

    * Source/WebKit/WebProcess/WebPage/WebFrame.cpp:
    (WebKit::WebFrame::parentFrame const):

    Canonical link: https://commits.webkit.org/275113@main

Canonical link: https://commits.webkit.org/274313.172@webkitglib/2.44

Source/WebKit/WebProcess/WebPage/WebFrame.cpp

@@ -713,7 +713,7 @@ String WebFrame::innerText() const
 RefPtr<WebFrame> WebFrame::parentFrame() const
 {
     RefPtr frame = m_coreFrame.get();
-    if (!frame || !frame->ownerElement())
+    if (!frame)
         return nullptr;
 
     RefPtr parentFrame = frame->tree().parent();