Modify *::get_cx methods to return a safe JSContext instead of a raw one

components/script/dom/xrwebgllayer.rs

@@ -115,7 +115,7 @@ impl XRWebGLLayer {
             0,
             constants::RGBA,
             constants::UNSIGNED_BYTE,
-            pixels.root(cx),
+            pixels.root(*cx),
         );
 
         // Bind the new texture to the framebuffer