No need to force relayout of children when page logical height changes.

third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt

Index: third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt b/third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt
index 25b19e1473180b768817578cab5bce8997a03302..07f46d5f2c67b38e448fe201a23939620b9718a1 100644
--- a/third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/win/paint/invalidation/multicol-repaint-expected.txt
@@ -7,11 +7,6 @@
       "drawsContent": true,
       "paintInvalidations": [
         {
-          "object": "LayoutMultiColumnFlowThread (anonymous)",
-          "rect": [9, 9, 400, 100],
-          "reason": "forced by layout"
-        },
-        {
           "object": "LayoutInline SPAN id='a'",
           "rect": [234, 10, 300, 56],
           "reason": "forced by layout"
@@ -20,41 +15,12 @@
           "object": "LayoutText #text",
           "rect": [234, 15, 300, 50],
           "reason": "full"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [9, 10, 13, 56],
-          "reason": "forced by layout"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
-      "object": "LayoutMultiColumnFlowThread (anonymous)",
-      "reason": "forced by layout"
-    },
-    {
-      "object": "RootInlineBox",
-      "reason": "forced by layout"
-    },
-    {
-      "object": "LayoutText #text",
-      "reason": "forced by layout"
-    },
-    {
-      "object": "InlineTextBox '\u00A0'",
-      "reason": "forced by layout"
-    },
-    {
-      "object": "LayoutBR BR",
-      "reason": "forced by layout"
-    },
-    {
-      "object": "InlineTextBox '\n'",
-      "reason": "forced by layout"
-    },
-    {
       "object": "LayoutInline SPAN id='a'",
       "reason": "forced by layout"
     },