Bug 1341102 - Update test expectation for servo/servo#16728.

MozReview-Commit-ID: LhpyLLtoVB6

layout/style/test/stylo-failures.md

@@ -169,9 +169,6 @@ to mochitest command.
 * Incorrect parsing
   * Incorrect bounds
     * test_bug664955.html `font size is larger than max font size` [2]
-  * calc() doesn't support dividing expression servo/servo#15192
-    * test_value_storage.html `calc(50px/` [7]
-    * ... `calc(2em / ` [9]
   * -moz-alt-content parsing is wrong: servo/servo#15726
     * test_property_syntax_errors.html `-moz-alt-content` [4]
   * mask shorthand servo/servo#15772