Bug 891840 - Disable test_pixel_lengths.html on all platforms for intermittent crashes.

CLOSED TREE

layout/style/test/mochitest.ini

@@ -160,6 +160,7 @@ skip-if = (toolkit == 'gonk' && debug) #debug-only failure; timed out
 [test_parse_url.html]
 [test_parser_diagnostics_unprintables.html]
 [test_pixel_lengths.html]
+skip-if = true # bug 891840 - intermittent crashes
 [test_pointer-events.html]
 [test_position_sticky.html]
 support-files = file_position_sticky.html