[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 feffbf8b2ab90cff37852e419f63960549f9eac6..bac80ee372cdf24ffe6c69109b12e9831cdcfe98 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -1248,7 +1248,7 @@ 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);
             layoutType = LayoutIfNeeded;
         }