Bug 1485972 - Set legend-position-relative.html as failing on webrender. r=me NPOTB

--HG--
extra : source : 001816b621d8bd754aa3e6f602f721f1add6d48a
extra : amend_source : a0b20782d80c684ef4d938a8f3a6af237b82c087

testing/web-platform/meta/MANIFEST.json

@@ -559711,7 +559711,7 @@
    "support"
   ],
   "css/css-values/reference/vh_not_refreshing_on_chrome-ref.html": [
-   "32ce9ada155649e9a4935e1abdddc3d3aadfca73",
+   "279d1c69b9f7fbe60edb55b7e8a5d507eda24936",
    "support"
   ],
   "css/css-values/reference/vh_not_refreshing_on_chrome_iframe-ref.html": [
@@ -559903,7 +559903,7 @@
    "support"
   ],
   "css/css-values/support/vh_not_refreshing_on_chrome_iframe.html": [
-   "c58ec57a58f29d4774b199ca82dd6d16607d4735",
+   "8d8e9b49d4aa3d9804a176852288e32ccaaa47d8",
    "support"
   ],
   "css/css-values/unset-value-storage.html": [
@@ -559971,7 +559971,7 @@
    "support"
   ],
   "css/css-values/vh_not_refreshing_on_chrome.html": [
-   "b4e0a413ab975dea429ca35642dc075a54127117",
+   "52a45a114c85bf96a175ca583d8a2b6f54b9ab6c",
    "reftest"
   ],
   "css/css-values/viewport-relative-lengths-scaled-viewport.html": [

testing/web-platform/meta/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-position-relative.html.ini

@@ -0,0 +1,3 @@
+[legend-position-relative.html]
+  expected:
+    if webrender: FAIL