fix: ENCRYPTED CONTENT WITHOUT DRM INFO on comcast X1 due to safari b…

…locklist (#6034)

lib/util/platform.js

@@ -237,7 +237,8 @@ shaka.util.Platform = class {
         !shaka.util.Platform.isVirginMedia() &&
         !shaka.util.Platform.isOrange() &&
         !shaka.util.Platform.isPS4() &&
-        !shaka.util.Platform.isAmazonFireTV();
+        !shaka.util.Platform.isAmazonFireTV() &&
+        !shaka.util.Platform.isWPE();
   }
 
   /**
@@ -292,6 +293,14 @@ shaka.util.Platform = class {
     return shaka.util.Platform.userAgentContains_('AFT');
   }
 
+  /**
+   * Check if the current platform is Comcast X1.
+   * @return {boolean}
+   */
+  static isWPE() {
+    return shaka.util.Platform.userAgentContains_('WPE');
+  }
+
   /**
    * Returns a major version number for Safari, or Safari-based iOS browsers.
    *