[APT-9577] Add DRM for downloads for offline usage : code improvement…

… : accept an empty map of custom headers for the HTTP data source, as there's no reason to exclude that case

Armadillo/src/main/java/com/scribd/armadillo/download/drm/DashDrmLicenseDownloader.kt

@@ -29,9 +29,9 @@ internal class DashDrmLicenseDownloader @Inject constructor(context: Context) :
         drmInfo: DrmInfo,
     ): DrmDownload {
         // Update data source for DRM license to add any DRM-specific request headers
-        drmDataSourceFactory.addCustomHeaders(drmInfo.drmHeaders)
+        drmDataSourceFactory.setDefaultRequestProperties(drmInfo.drmHeaders)
         // Update data source for audio to add custom headers
-        audioDataSourceFactory.addCustomHeaders(customRequestHeaders)
+        audioDataSourceFactory.setDefaultRequestProperties(customRequestHeaders)
 
         // Create helper to download DRM license
         val offlineHelper = when (drmInfo.drmType) {
@@ -66,10 +66,4 @@ internal class DashDrmLicenseDownloader @Inject constructor(context: Context) :
             throw DrmDownloadException(e)
         }
     }
-
-    private fun DefaultHttpDataSource.Factory.addCustomHeaders(customHeaders: Map<String, String>) {
-        customHeaders.takeIf { it.isNotEmpty() }?.let { headers ->
-            setDefaultRequestProperties(headers)
-        }
-    }
 }