Remove unused package_js.py

Reviewed By: AaaChiuuu

Differential Revision: D5200573

fbshipit-source-id: 5bc5cc66d3ce979a6ca2db9241e1de4eab45f234

ReactAndroid/src/main/java/com/facebook/react/bridge/BUCK

@@ -1,18 +1,5 @@
 include_defs("//ReactAndroid/DEFS")
 
-# We package the JS files from the bundler and local directory into what we
-# pretend is an ordinary JAR file. By putting them under the assets/ directory
-# within the zip file and relying on Buck to merge its contents into the APK,
-# our JS bundles arrive in a place accessible by the AssetManager at runtime.
-
-python_binary(
-    name = "package_js",
-    main = "package_js.py",
-    visibility = [
-        "PUBLIC",
-    ],
-)
-
 android_library(
     name = "bridge",
     srcs = glob(["**/*.java"]),