Don't create layout objects for children of display-none iframes.

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

Index: third_party/WebKit/Source/core/loader/FrameLoaderClient.h
diff --git a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
index c513826466d29b9f9affd8578a3b4a5ae2ce7f36..119e889474e284366a1be15536fe6779bc447267 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
+++ b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
@@ -60,7 +60,6 @@ class Document;
 class DocumentLoader;
 struct FrameLoadRequest;
 class HTMLFormElement;
-class HTMLFrameElementBase;
 class HTMLFrameOwnerElement;
 class HTMLMediaElement;
 class HTMLPlugInElement;
@@ -280,7 +279,7 @@ class CORE_EXPORT FrameLoaderClient : public FrameClient {
                                            ContentSecurityPolicyHeaderType,
                                            ContentSecurityPolicyHeaderSource) {}
 
-  virtual void didChangeFrameOwnerProperties(HTMLFrameElementBase*) {}
+  virtual void didChangeFrameOwnerProperties(HTMLFrameOwnerElement*) {}
 
   virtual void dispatchWillStartUsingPeerConnectionHandler(
       WebRTCPeerConnectionHandler*) {}