Enable CSS position tests and add results

This also removes imported position: sticky tests from the Mozilla
directory. These were only supposed to be temporary until the upstream
version from WPT were imported.

tests/wpt/mozilla/meta/css/css-position-3/__dir__.ini

@@ -1 +0,0 @@
-disabled: Sending multiple scrolling positions to WebRender is very flaky in the test harness

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-get-bounding-client-rect.html.ini

@@ -1,17 +0,0 @@
-[position-sticky-get-bounding-client-rect.html]
-  type: testharness
-  [Untitled]
-    expected: FAIL
-
-  [sticky positioned element should be observable by getBoundingClientRect.]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-
-  [getBoundingClientRect should be correct for sticky after script insertion]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-
-  [getBoundingClientRect should be correct for sticky after script-caused layout]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-grid.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-grid.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18379
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-inline.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-inline.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18379
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-bottom.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-bottom.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-inline.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-inline.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-left.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-left.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-right.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-right.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-table.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-table.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-nested-top.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-nested-top.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18377
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-offset-top-left.html.ini

@@ -1,10 +0,0 @@
-[position-sticky-offset-top-left.html]
-  type: testharness
-  [offsetTop/offsetLeft should be correct for sticky after script insertion]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-
-  [offsetTop/offsetLeft should be correct for sticky after script-caused layout]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-overflow-padding.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-overflow-padding.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18379
-  [Untitled]
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-parsing.html.ini

@@ -1,6 +0,0 @@
-[position-sticky-parsing.html]
-  type: testharness
-  [The value of sticky for the position property should be parsed correctly]
-    bug: https://github.com/servo/servo/issues/18378
-    expected: FAIL
-

tests/wpt/mozilla/meta/css/css-position-3/position-sticky-writing-modes.html.ini

@@ -1,7 +0,0 @@
-[position-sticky-writing-modes.html]
-  type: reftest
-  expected: FAIL
-  bug: https://github.com/servo/servo/issues/18379
-  [Untitled]
-    expected: FAIL
-