ColumnBalancer: don't skip bounds checking on first or last fragmentainer groups.

third_party/WebKit/Source/core/layout/ColumnBalancer.h

Index: third_party/WebKit/Source/core/layout/ColumnBalancer.h
diff --git a/third_party/WebKit/Source/core/layout/ColumnBalancer.h b/third_party/WebKit/Source/core/layout/ColumnBalancer.h
index e559e05a4028d6c9e98489e128e02412e8cde9b6..40fd612c4f522ca49773b5a17b546d94680b132c 100644
--- a/third_party/WebKit/Source/core/layout/ColumnBalancer.h
+++ b/third_party/WebKit/Source/core/layout/ColumnBalancer.h
@@ -33,14 +33,14 @@ protected:
 
     bool isLogicalTopWithinBounds(LayoutUnit logicalTopInFlowThread) const
     {
-        return (m_group.isFirstGroup() || logicalTopInFlowThread >= m_group.logicalTopInFlowThread())
-            && (m_group.isLastGroup() || logicalTopInFlowThread < m_group.logicalBottomInFlowThread());
+        return logicalTopInFlowThread >= m_group.logicalTopInFlowThread()
+            && logicalTopInFlowThread < m_group.logicalBottomInFlowThread();
     }
 
     bool isLogicalBottomWithinBounds(LayoutUnit logicalBottomInFlowThread) const
     {
-        return (m_group.isFirstGroup() || logicalBottomInFlowThread > m_group.logicalTopInFlowThread())
-            && (m_group.isLastGroup() || logicalBottomInFlowThread <= m_group.logicalBottomInFlowThread());
+        return logicalBottomInFlowThread > m_group.logicalTopInFlowThread()
+            && logicalBottomInFlowThread <= m_group.logicalBottomInFlowThread();
     }
 
     // Examine and collect column balancing data from a layout box that has been found to intersect