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 1aa35a2156319a3f7e0ebbef0c86e1bc28a1b05a..53674c1838260cb54269187d0ec2abe8967eb122 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -1585,11 +1585,6 @@ WebString WebLocalFrameImpl::layerTreeAsText(bool showDebugInfo) const
 
 // 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);
@@ -1691,7 +1686,10 @@ PassRefPtrWillBeRawPtr<LocalFrame> WebLocalFrameImpl::createChildFrame(const Fra
     const AtomicString& name, HTMLFrameOwnerElement* ownerElement)
 {
     ASSERT(m_client);
-    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags())));
+    WebTreeScopeType scope = frame()->document() == ownerElement->treeScope()

[dcheng, 2015/05/21 22:50:10]

This is probably the most significant change in this patch, outside of the
FrameTree.cpp changes.

+        ? WebTreeScopeType::Document
+        : WebTreeScopeType::Shadow;
+    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, scope, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags())));
     if (!webframeChild)
         return nullptr;