Don't always fully repaint on viewport resize

LayoutTests/fast/repaint/window-resize-media-query-expected.txt

Index: LayoutTests/fast/repaint/window-resize-media-query-expected.txt
diff --git a/LayoutTests/fast/repaint/window-resize-media-query-expected.txt b/LayoutTests/fast/repaint/window-resize-media-query-expected.txt
index 8bf67a81f45dcd7403622ed0af3b8f1f2179607c..2d0bcf306f460ab73989364abb5e2ca1863c94e8 100644
--- a/LayoutTests/fast/repaint/window-resize-media-query-expected.txt
+++ b/LayoutTests/fast/repaint/window-resize-media-query-expected.txt
@@ -7,9 +7,6 @@
       (drawsContent 1)
       (repaint rects
         (rect 0.00 0.00 200.00 200.00)
-        (rect 0.00 0.00 200.00 200.00)
-        (rect 0.00 0.00 200.00 200.00)
-        (rect 0.00 0.00 200.00 200.00)
       )
     )
   )
@@ -23,8 +20,6 @@
       (drawsContent 1)
       (repaint rects
         (rect 0.00 0.00 200.00 300.00)
-        (rect 0.00 0.00 200.00 300.00)
-        (rect 0.00 0.00 200.00 300.00)
       )
     )
   )
@@ -37,9 +32,7 @@
       (contentsOpaque 1)
       (drawsContent 1)
       (repaint rects
-        (rect 0.00 0.00 300.00 300.00)
-        (rect 0.00 0.00 300.00 300.00)
-        (rect 0.00 0.00 300.00 250.00)
+        (rect 0.00 250.00 300.00 50.00)
       )
     )
   )
@@ -52,9 +45,8 @@
       (contentsOpaque 1)
       (drawsContent 1)
       (repaint rects
+        (rect 250.00 0.00 50.00 250.00)
         (rect 0.00 0.00 300.00 250.00)
-        (rect 0.00 0.00 300.00 250.00)
-        (rect 0.00 0.00 250.00 250.00)
       )
     )
   )