Don't create layout objects for children of display-none iframes.

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/shift-relative-positioned-container-with-image-removal-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [785, 742],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow HTML",
@@ skipping 19 matching lines @@
           "object": "LayoutBlockFlow (anonymous)",
           "rect": [8, 92, 769, 99],
           "reason": "layoutObject removal"
         },
         {
           "object": "LayoutIFrame IFRAME id='iframe'",
           "rect": [8, 92, 732, 94],
           "reason": "layoutObject removal"
         },
         {
+          "object": "LayoutBlockFlow HTML",
+          "rect": [10, 94, 728, 90],
+          "reason": "layoutObject removal"
+        },
+        {
+          "object": "LayoutBlockFlow BODY",
+          "rect": [18, 102, 712, 74],
+          "reason": "layoutObject removal"
+        },
+        {
           "object": "LayoutImage IMG",
           "rect": [58, 241, 489, 537],
           "reason": "bounds change"
         },
         {
           "object": "LayoutImage IMG",
           "rect": [58, 142, 489, 537],
           "reason": "bounds change"
         }
       ]
@@ skipping 28 matching lines @@
       "object": "RootInlineBox",
       "reason": "bounds change"
     },
     {
       "object": "LayoutImage IMG",
       "reason": "bounds change"
     },
     {
       "object": "LayoutText #text",
       "reason": "location change"
+    },
+    {
+      "object": "LayoutBlockFlow BODY",
+      "reason": "layoutObject removal"
+    },
+    {
+      "object": "LayoutBlockFlow HTML",
+      "reason": "layoutObject removal"
     }
   ]
 }