[css-flexbox] Don't add extra space-between space at the end

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 e859346c655bc793bf52353ddae4f599a063557c..3d7d93b4e88dddf1a86c2344a1ba5f2d3d531d8a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -1870,8 +1870,11 @@ void LayoutFlexibleBox::layoutAndPlaceChildren(
     setFlowAwareLocationForChild(*child, childLocation);
     mainAxisOffset += childMainExtent + flowAwareMarginEndForChild(*child);
 
-    mainAxisOffset += justifyContentSpaceBetweenChildren(
-        availableFreeSpace, distribution, children.size());
+    if (i != children.size() - 1) {
+      // The last item does not get extra space added.
+      mainAxisOffset += justifyContentSpaceBetweenChildren(
+          availableFreeSpace, distribution, children.size());
+    }
 
     if (isPaginated)
       updateFragmentationInfoForChild(*child);