Remove compat scripts and move API URL redirection to contentSetup

ext/src/shim/contentSetup.ts

@@ -4,3 +4,40 @@ const _window = (window.wrappedJSObject as any);
 
 _window.chrome = cloneInto({}, window);
 _window.navigator.presentation = cloneInto({}, window);
+
+
+
+const EXT_SENDER_SCRIPT_URLS = [
+    "chrome-extension://pkedcjkdefgpdelpbcmbmeomcjbeemfm/cast_sender.js"
+  , "chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js"
+];
+
+const SENDER_SCRIPT_URL = "https://www.gstatic.com/cv/js/sender/v1/cast_sender.js";
+
+
+/**
+ * Replace the src property setter on <script> elements to
+ * intercept the new value.
+ *
+ * If it matches one of Chrome's cast extension sender script
+ * URLs, replace it with the standard API URL, the request for
+ * which is handled in the main script.
+ */
+const { get, set } = Reflect.getOwnPropertyDescriptor(
+        HTMLScriptElement.prototype.wrappedJSObject, "src");
+
+Reflect.defineProperty(
+        HTMLScriptElement.prototype.wrappedJSObject, "src", {
+
+    configurable: true
+  , enumerable: true
+  , get
+
+  , set: exportFunction(function (value) {
+        if (EXT_SENDER_SCRIPT_URLS.includes(value)) {
+            return set.call(this, SENDER_SCRIPT_URL);
+        }
+
+        return set.call(this, value);
+    }, window)
+});