Don't invalidate cell when collapsed border changes

Source/core/layout/LayoutTableCell.cpp

Index: Source/core/layout/LayoutTableCell.cpp
diff --git a/Source/core/layout/LayoutTableCell.cpp b/Source/core/layout/LayoutTableCell.cpp
index b74d0ced08f00dfefe75f2c9fba87d7b1acb7724..296f32745de18e8ac7e8a83a55ad847d749a1ac4 100644
--- a/Source/core/layout/LayoutTableCell.cpp
+++ b/Source/core/layout/LayoutTableCell.cpp
@@ -954,15 +954,10 @@ void LayoutTableCell::collectBorderValues(LayoutTable::CollapsedBorderValues& bo
     CollapsedBorderValue beforeBorder = computeCollapsedBeforeBorder();
     CollapsedBorderValue afterBorder = computeCollapsedAfterBorder();
     LayoutTableSection* section = this->section();
-    bool changed = section->setCachedCollapsedBorder(this, CBSStart, startBorder);
-    changed |= section->setCachedCollapsedBorder(this, CBSEnd, endBorder);
-    changed |= section->setCachedCollapsedBorder(this, CBSBefore, beforeBorder);
-    changed |= section->setCachedCollapsedBorder(this, CBSAfter, afterBorder);
-
-    // In slimming paint mode, we need to invalidate all cells with collapsed border changed.
-    // FIXME: Need a way to invalidate/repaint the borders only. crbug.com/451090#c5.
-    if (changed && RuntimeEnabledFeatures::slimmingPaintEnabled())
-        invalidateDisplayItemClient(*this);
+    section->setCachedCollapsedBorder(this, CBSStart, startBorder);
+    section->setCachedCollapsedBorder(this, CBSEnd, endBorder);
+    section->setCachedCollapsedBorder(this, CBSBefore, beforeBorder);
+    section->setCachedCollapsedBorder(this, CBSAfter, afterBorder);
 
     addBorderStyle(borderValues, startBorder);
     addBorderStyle(borderValues, endBorder);