Revert of Update Blink to use the tree scope info on WebFrame for scoping checks.

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index 53674c1838260cb54269187d0ec2abe8967eb122..1aa35a2156319a3f7e0ebbef0c86e1bc28a1b05a 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -1585,6 +1585,11 @@
 
 // WebLocalFrameImpl public ---------------------------------------------------------
 
+WebLocalFrame* WebLocalFrame::create(WebFrameClient* client)
+{
+    return WebLocalFrame::create(WebTreeScopeType::Document, client);
+}
+
 WebLocalFrame* WebLocalFrame::create(WebTreeScopeType scope, WebFrameClient* client)
 {
     return WebLocalFrameImpl::create(scope, client);
@@ -1686,10 +1691,7 @@
     const AtomicString& name, HTMLFrameOwnerElement* ownerElement)
 {
     ASSERT(m_client);
-    WebTreeScopeType scope = frame()->document() == ownerElement->treeScope()
-        ? WebTreeScopeType::Document
-        : WebTreeScopeType::Shadow;
-    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, scope, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags())));
+    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags())));
     if (!webframeChild)
         return nullptr;