Replace `window` references in ActionCable with `self`

Before this change, attempting to use ActionCable inside a web worker
would result in an exception being thrown:
```
ReferenceError: window is not defined
```

By replacing the `window` reference with `self`, which is available in
both a window context and a worker context, we can avoid this error.

Ref:
https://developer.mozilla.org/en-US/docs/Web/API/Window/self

1 files changed, 4 insertions, 4 deletions

diff --git a/actioncable/test/javascript/src/unit/action_cable_test.js b/actioncable/test/javascript/src/unit/action_cable_test.js
index daad900aca..83426fa32e 100644
--- a/actioncable/test/javascript/src/unit/action_cable_test.js
+++ b/actioncable/test/javascript/src/unit/action_cable_test.js
@@ -6,14 +6,14 @@ const {module, test} = QUnit
 module("ActionCable", () => {
   module("Adapters", () => {
     module("WebSocket", () => {
-      test("default is window.WebSocket", assert => {
-        assert.equal(ActionCable.adapters.WebSocket, window.WebSocket)
+      test("default is self.WebSocket", assert => {
+        assert.equal(ActionCable.adapters.WebSocket, self.WebSocket)
       })
     })
 
     module("logger", () => {
-      test("default is window.console", assert => {
-        assert.equal(ActionCable.adapters.logger, window.console)
+      test("default is self.console", assert => {
+        assert.equal(ActionCable.adapters.logger, self.console)
       })
     })
   })