Auto merge of #20139 - servo-wpt-sync:wpt_update_27-02-2018, r=jdm

Sync WPT with upstream (27-02-2018)

Automated downstream sync of changes from upstream as of 27-02-2018.
[no-wpt-sync]

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tests/wpt/mozilla/meta/css/border-image-linear-gradient.html.ini

@@ -1,4 +1,3 @@
 [border-image-linear-gradient.html]
   type: reftest
   expected: FAIL
-

tests/wpt/mozilla/meta/css/iframe/hide_after_load.html.ini

@@ -1,2 +0,0 @@
-[hide_after_load.html]
-  expected: TIMEOUT

tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/glsl/misc/shader-with-non-reserved-words.html.ini

@@ -1,6 +1,5 @@
 [shader-with-non-reserved-words.html]
   type: testharness
-  expected: TIMEOUT
   [WebGL test #1696: shader with: 'dmat2' failed to compile]
     expected: FAIL
 
@@ -145,6 +144,3 @@
   [WebGL test #1862: shader with: 'dmat4x4' failed to compile]
     expected: FAIL
 
-  [Overall test]
-    expected: NOTRUN
-