fix: 4676 - Virgin Media set top box is incorrectly categorized as Ap…

…ple/Safari (#4678)

In order to get the playback working, I am excluding VirginMedia device
from isApple() platform test, otherwise it incorrectly fails at
isBrowserSupported().

Fixes #4676

Co-authored-by: Casey Occhialini <1508707+littlespex@users.noreply.github.com>

lib/util/platform.js

@@ -213,6 +213,7 @@ shaka.util.Platform = class {
     return !!navigator.vendor && navigator.vendor.includes('Apple') &&
         !shaka.util.Platform.isTizen() &&
         !shaka.util.Platform.isEOS() &&
+        !shaka.util.Platform.isVirginMedia() &&
         !shaka.util.Platform.isPS4() &&
         !shaka.util.Platform.isAmazonFireTV();
   }
@@ -237,6 +238,13 @@ shaka.util.Platform = class {
     return shaka.util.Platform.userAgentContains_('PlayStation 4');
   }
 
+  /**
+   * Check if the current platform is Virgin Media device.
+   */
+  static isVirginMedia() {
+    return shaka.util.Platform.userAgentContains_('VirginMedia');
+  }
+
   /**
    * Check if the current platform is Amazon Fire TV.
    * https://developer.amazon.com/docs/fire-tv/identify-amazon-fire-tv-devices.html