Move the frame tree into the embedder.

Source/web/tests/FrameTestHelpers.cpp

Index: Source/web/tests/FrameTestHelpers.cpp
diff --git a/Source/web/tests/FrameTestHelpers.cpp b/Source/web/tests/FrameTestHelpers.cpp
index 0004cf070b83736610f7b69031367bb9d03e8444..fc25299e7fe7f16e35f3a6ec12d219cdf5d0d5af 100644
--- a/Source/web/tests/FrameTestHelpers.cpp
+++ b/Source/web/tests/FrameTestHelpers.cpp
@@ -147,11 +147,15 @@ void WebViewHelper::reset()
 
 WebFrame* TestWebFrameClient::createChildFrame(WebFrame* parent, const WebString& frameName)
 {
-    return WebFrame::create(this);
+    WebFrame* frame = WebFrame::create(this);
+    parent->appendChild(frame);
+    return frame;
 }
 
 void TestWebFrameClient::frameDetached(WebFrame* frame)
 {
+    if (frame->parent())
+        frame->parent()->removeChild(frame);
     frame->close();
 }