Remove logic forcing paint invalidation with non-composited scrollbars

third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt

Index: third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt
diff --git a/third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt b/third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt
index 310e9e673c2ba945c5713fa6d60b5761a3858292..e6611844b98703782942d51110e13a62a8a1c59f 100644
--- a/third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/scrollbar-invalidation-on-resize-expected.txt
@@ -8,13 +8,13 @@
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV id='scrollable'",
-          "rect": [8, 50, 300, 100],
-          "reason": "border box change"
+          "rect": [8, 135, 285, 15],
+          "reason": "scroll"
         },
         {
           "object": "LayoutBlockFlow (positioned) DIV id='scrollable'",
-          "rect": [8, 135, 285, 15],
-          "reason": "scroll"
+          "rect": [108, 50, 200, 100],
+          "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow (positioned) DIV id='scrollable'",
@@ -47,7 +47,7 @@
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV id='scrollable'",
-      "reason": "border box change"
+      "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow (positioned) DIV id='scrollable'",