Don't invalidate cell when collapsed border changes

Source/core/layout/LayoutTableSection.cpp

Index: Source/core/layout/LayoutTableSection.cpp
diff --git a/Source/core/layout/LayoutTableSection.cpp b/Source/core/layout/LayoutTableSection.cpp
index d429db7252bc7090b4ffeff46ca27de4cfc9b792..42ddda26766d1b17236e7f4210ae6ff4ddf86216 100644
--- a/Source/core/layout/LayoutTableSection.cpp
+++ b/Source/core/layout/LayoutTableSection.cpp
@@ -1602,19 +1602,14 @@ void LayoutTableSection::removeCachedCollapsedBorders(const LayoutTableCell* cel
         m_cellsCollapsedBorders.remove(std::make_pair(cell, side));
 }
 
-bool LayoutTableSection::setCachedCollapsedBorder(const LayoutTableCell* cell, CollapsedBorderSide side, const CollapsedBorderValue& border)
+void LayoutTableSection::setCachedCollapsedBorder(const LayoutTableCell* cell, CollapsedBorderSide side, const CollapsedBorderValue& border)
 {
     ASSERT(table()->collapseBorders());
     CellsCollapsedBordersMap::iterator it = m_cellsCollapsedBorders.find(std::make_pair(cell, side));
-    if (it == m_cellsCollapsedBorders.end()) {
+    if (it == m_cellsCollapsedBorders.end())
         m_cellsCollapsedBorders.add(std::make_pair(cell, side), border);
-        return true;
-    }
-    if (!it->value.equals(border)) {
+    else
         it->value = border;
-        return true;
-    }
-    return false;
 }
 
 const CollapsedBorderValue& LayoutTableSection::cachedCollapsedBorder(const LayoutTableCell* cell, CollapsedBorderSide side) const