[cssom-view] Remove redundant IDL tests

Part of web-platform-tests#11510.

Author: zcorpan

css/cssom-view/cssom-view-window-screen-interface.html

@@ -13,15 +13,6 @@
         <div id="myDiv"></div>
         <div id="log"></div>
         <script>
-        /*test readonly*/
-        test(function(){assert_readonly(window.screen, "availWidth");}, "Screen.availWidth is readonly");
-        test(function(){assert_readonly(window.screen, "availHeight");}, "Screen.availHeight is readonly");
-        test(function(){assert_readonly(window.screen, "width");}, "Screen.width is readonly");
-        test(function(){assert_readonly(window.screen, "height");}, "Screen.height is readonly");
-        test(function(){assert_readonly(window.screen, "colorDepth");}, "Screen.colorDepth is readonly");
-        test(function(){assert_readonly(window.screen, "pixelDepth");}, "Screen.pixelDepth is readonly");
-
-
         test(function(){assert_true(window.screen.width >= 0 && window.screen.width < 6000000);},
             "window.screen.width >= 0 && window.screen.width < 6000000");
         test(function(){assert_true(window.screen.height >= 0 && window.screen.height < 6000000);},