[css-flexbox] Have to use forceChildLayout to force layout

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
index e11d05ef4e84c1ba25910c3ec00c369f94bd1eb6..49e6b4d8b08ddc3ed858f53a52d97e125953828e 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -1220,7 +1220,7 @@ bool LayoutFlexibleBox::computeNextFlexLine(OrderedFlexItemList& orderedChildren
         // run layout on it now to make sure its logical height and scroll bars are up to date.
         if (childHasIntrinsicMainAxisSize(*child) && child->needsLayout()) {
             child->clearOverrideSize();
-            child->layoutIfNeeded();
+            child->forceChildLayout();
             cacheChildMainSize(*child);
         }