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

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 3345c0fdc8beb318535d43941143d8a39ca3e254..77c1366b3133990800bad1df47978b3df3500aa2 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -4497,19 +4497,12 @@
 
 void Document::willChangeFrameOwnerProperties(int marginWidth,
                                               int marginHeight,
-                                              ScrollbarMode scrollingMode,
-                                              bool isDisplayNone) {
+                                              ScrollbarMode scrollingMode) {
+  if (!body())
+    return;
+
   DCHECK(frame() && frame()->owner());
   FrameOwner* owner = frame()->owner();
-
-  if (documentElement()) {
-    if (isDisplayNone != owner->isDisplayNone()) {
-      documentElement()->lazyReattachIfAttached();
-    }
-  }
-
-  if (!body())
-    return;
 
   if (marginWidth != owner->marginWidth())
     body()->setIntegralAttribute(marginwidthAttr, marginWidth);