Bug 1178871 - turn on WebGL conformance test |conformance/glsl/misc/shader-struct-scope|. r=jgilbert

dom/canvas/test/webgl-conf/generated-mochitest.ini

@@ -2662,7 +2662,6 @@ fail-if = (os == 'win' && os_version == '5.1')
 fail-if = (os == 'android' && android_version == '10')
 [generated/test_conformance__glsl__misc__shader-precision-format-obeyed.html]
 [generated/test_conformance__glsl__misc__shader-struct-scope.html]
-fail-if = (os == 'mac')
 [generated/test_conformance__glsl__misc__shader-uniform-packing-restrictions.html]
 skip-if = (os == 'android')
 [generated/test_conformance__glsl__misc__shader-varying-packing-restrictions.html]

dom/canvas/test/webgl-conf/mochitest-errata.ini

@@ -405,9 +405,6 @@ skip-if = (os == 'mac')
 # application crashed [@ gldAttachDrawable + 0x9e0]. Also crash on Android.
 skip-if = (os == 'mac') || (os == 'android')
 
-[generated/test_conformance__glsl__misc__shader-struct-scope.html]
-fail-if = (os == 'mac')
-
 [generated/test_conformance__extensions__oes-vertex-array-object.html]
 # 10.6 crash:
 # PROCESS-CRASH | dom/canvas/test/webgl-conf/generated/test_conformance__extensions__oes-vertex-array-object.html | application crashed [@ gleRunVertexSubmitImmediate + 0xf24]